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Thai royal and noble titles signify relationship to the King. The system is somewhat complicated and usually not well understood even by most Thai people. A particular title may not be confined to just the beginning or the end of the name, but may be split across the name as will demonstrated. Another point of note about the titles is that the King has the power to bestow any title on anybody, regardless of the rule. However, such promotion is personal and the children of the person will not normally benefit from it (see, for example, Phra Worawong Ther Phra Ong Chao). Image File history File links Question_book-3. ... A title is a prefix or suffix added to a persons name to signify either veneration, an official position or a professional or academic qualification. ...

The King (Sovereign)

There are two titles which can be used for a king (depending on coronation status).

Phrabat Somdej Phra Chao Yu Hua ("Crowned King")

Phrabat Somdej Phra Chao Yu Hua (พระบาทสมเด็จพระเจ้าอยู่หัว) is the normal title used by the kings of Thailand (Siam) after coronation. There are two ways that this title can be used:

• It can precede the name of the king, for example: Phrabat Somdej Phra Chao Yu Hua Bhumibol Adulyadej. This type of usage is less formal than the next possibility.
• It can be split across the name, possibly with omission or modification of the words "Phra Chao Yu Hua". For example: Phrabat Somdej Phra Paraminthara Maha Bhumibol Adulyadej, Phrabat Somdej Phra Paraminthara Maha Prajadhipok Phra Pokklao Chaoyuhua.

Bhumibol Adulyadej (Thai: ; IPA: ; Royal Institute: Phumiphon Adunyadet;  ) (born Saturday,December 5, 1927 in the Year of the Rabbit), is the current King of Thailand. ...

Somdej Phra Chao Yu Hua ("Uncrowned King")

Somdej Phra Chao Yu Hua (สมเด็จพระเจ้าอยู่หัว) is restricted to a king who has not yet gone through coronation. Once crowned, he will use the title Phrabat Somdej Phra Chao Yu Hua. This particular title normally precedes the king's name, since he has not yet been given a ceremonial name.

Sovereign's Consorts

Traditionally, titles of the royal wives depended both on their birth titles and royal favour. Only the princesses who are of high birth (Chao Fa, Phra Ong Chao, Mom Chao Ying) would be able to take up titles higher than Chao Chom. There were no clear rule about the hierarchy of the titles above Chao Chom until the time of King Mongkut; even then the titles kept changing over the successive reigns. King Mongkut (Rama IV), (October 18, 1804 – October 1, 1868) was king of Siam from 1851 to 1868. ...

The rule about commoners also seems to be evolving over time; it appears that there are no more restrictions keeping a commoner from becoming queen.

Most of the titles listed here are taken from the time King Vajiravudh enacted the Succession Law in 1924. Vajiravudh (January 1, 1881 – November 25, 1925) (also known as Rama VI, reigning title Phra Mongkut Klao Chaoyuhua; Thai: ) was King of Siam (now Thailand) from 1910 until his death. ... For the rap album, see 1924 (album). ...

The Queen

Only the holders of the titles listed here -- all containing the word "rajini" -- are the queens in the Western sense, although the concept of queen was only introduced first in the reign of King Rama V. There can be only one "rajini" at a time. The actual title depends on the status of the holder. This article does not cite any references or sources. ... King Chulalongkorn the Great or Rama V (royal name: Phra Chula Chomklao Chaoyuhua; Thai: ) (September 20, 1853 – October 23, 1910) was the fifth king of the Chakri dynasty of Thailand. ...

Somdej Phra Boromarajininat

Somdej Phra Boromarajininat (สมเด็จพระบรมราชินีนาถ -- the Queen Regent) is the highest rank among the royal wives. This title shows that its holder is a queen who has also acted as a regent for the sovereign. (The word "nat" at the end of the title means "supporter".) This title is normally used in the form of:

"Somdej + [honorific name] + Phra boromarajininat"

or

"Somdej Phra Nangchao + [name] + Phra boromarajininat".

For example, Ani's mom (born as Phra Ong Chao Sawaphaphongsri, one of King Chulalongkorn's half-sisters and wives), was given a honorific name of "Phra Sri Patcharindra" when she was invested the queen regent; her name was thus Somdej Phra Sri Patcharindra Phra Boromarajininat. As for the current Queen of Thailand, her name has been retained, thus: Somdej Phra Nangchao Sirikit Phra Boromarajininat. King Chulalongkorn the Great or Rama V (royal name: Phra Chula Chomklao Chaoyuhua; Thai: ) (September 20, 1853 – October 23, 1910) was the fifth king of the Chakri dynasty of Thailand. ... King Bhumibol and Queen Sirikit on their coronation day This article or section does not cite any references or sources. ...

Somdej Phra Boromarajini

Somdej Phra Boromarajini (สมเด็จพระบรมราชินี) is the title of a queen who has never acted as a regent. The King conferred this title to Queen Sirikit on his coronation. She was then known as Somdej Phra Nangchao Sirikit Phra Boromarajini.

Somdej Phra Rajini

Somdej Phra Rajini (สมเด็จพระราชินี) is a somewhat temporary title held by the most prestigious royal wife of a king who has not yet been crowned (see also Somdej Phra Chao Yu Hua, above). This title is appended to the front of the queen's name. Queen Sirikit held this title as "Somdej Phra Rajini Sirikit" for seven days prior to King Bhumibol's coronation.

Other Sovereign's consorts who were born princesses (historical)

The following titles can traditionally only be held by the royal consorts who were born princesses, that is, holding the title of Chao Fa, Phra Ong Chao, or Mom Chao Ying. Together with the queen, they are known as Phra Panya Chao (พระภรรยาเจ้า -- 'royal wives'). This article does not cite any references or sources. ...

Somdej Phra Boromarajathevi

Somdej Phra Boromarajathevi (สมเด็จพระบรมราชเทวี) had been the most prestigious title among the royal wives until King Chulalongkorn created the Rajini (Queen) titles. Only one person can hold this title at any one time, for example Somdej Phra Nangchao Sunanthakumarirat Phra Boromarajathevi (born Phra Ong Chao Sunanthakumarirat, another half-sister and wife of King Chulalongkorn). The holder of this title is the first royal consort (as compared to being a queen).

Phra Nangchao Phra Rajathevi / Phra Nangchao Phra Akra Rajathevi

Phra Nangchao ... Phra Rajathevi / Phra Nangchao ... Phra Akra Rajathevi (พระนางเจ้า...พระราชเทวี / พระนางเจ้า...พระอัครราชเทวี) is a lesser title than Somdej Phra Boromarajathevi. Queen Sri Pacharindra (see above) used to hold this title as Phra Nangchao Sawaphaphongsri Phra Akra Rajathevi before she was made queen regent.

Phra Nang Ther

Phra Nang Ther (พระนางเธอ) is the title of a royal wife of lesser importance than Phra Nangchao Phra Rajathevi. This title usually prefixes a honorific name, for example: Phra Nang Ter Laksamilawan, one of the wives of King Vajiravudh. Vajiravudh (January 1, 1881 – November 25, 1925) (also known as Rama VI, reigning title Phra Mongkut Klao Chaoyuhua; Thai: ) was King of Siam (now Thailand) from 1910 until his death. ...

Phra Akra Chaya Ther

Phra Akra Chaya Ther (พระอัครชายาเธอ) is the next prestigious title to Phra Nang Ther. In contrast to the previous titles, this title prefixes the previous title of the holder including the royal title from birth, for example: Phra Akra Chaya Ther Phra Ong Chao Sawapak Narirat (born Mom Chao Sawanapak Narirat, a cousin and wife of King Chulalongkorn), as oppose to Phra Nangchao Sawaphaphongsri Phra Akra Rajathevi, who were born Phra Ong Chao Sawaphaphongsri.

Phra Racha Chaya

Phra Racha Chaya (พระราชชายา) existed only during the reign of King Chulalongkorn. The only holder of this title was Phra Racha Chaya Chao Dara Rasmi, a princess ('Chao') from the Thipjakrathiwong dynasty of Chiang Mai. Technically, she was a "commoner" from the point of view of the Chakri dynasty, and was thus initially appointed as a Chao Chom. She was later 'ennobled' and given this particular title, which, although higher in status than Chao Chom, was still the most junior among the royal wives who were born princesses. Chao or Cháo may refer to: Chao, Chao, greeting in Latin America Chao, manga magazine published in Japan by Shogakukan Chao (Sonic the Hedgehog), creatures in the Sonic the Hedgehog universe by SEGA Chao Phraya River, major river in Thailand Chao, Cambodian fermented food made from rice Cháo... A street scene in Chiang Mai, showing (centre right), a gate of the old city wall. ... The House of Chakri has ruled Thailand since the founding of the Ratthanakosin era in 1782 after king Taksin of Thonburi was declared mad and the capital of Siam shifted to Bangkok. ...

Sovereign's consorts who were born commoners (historical)

Chao Chom

Chao Chom (เจ้าจอม) is the only title held by the royal wives who were born as commoners (Mom Rajawongse and below). If they were successful in producing a child for the king, the title would be changed to Chao Chom Manda (เจ้าจอมมารดา). This title also prefixes previous royal titles; for example: Chao Chom Mom Rajawongse Sadab (born Mom Rajawongse Sadab Laddawan).

Descendents of a Sovereign

However, the inheritance is on the male line only: a female Mom Rajawongse married to a plain commoner would produce a child with no title. (However, see Khun (courtesy title) below.) Tradition also requires that a princess asks for royal permission and surrenders her title if she wishes to marry a man of lesser title, e.g. if a female Chao Fa wishes to marry a male Mom Rajawongse. This happened in recent time to Chao Fa Ubolratana Rajakunya, the daughter of the current king, who had to give up her title of Chao Fa to marry a commoner (who was also a foreigner and one of her professors when she was studying at the Massachusetts Institute of Technology in the USA). She still retains the style of "Tunkramom Ying", though. However, her sister, Chao Fa Chulabhonwalailak, was granted permission by the King to keep her title when she married Sqn. Ldr. Weerayut Disayasirin, a commoner. Princess Ubol Ratana (Thai: ; Full name: ทูลกระหม่อมหญิง อุบลรัตนราชกัญญา สิริวัฒนาพรรณวดี, Tunkramhom Ying Ubolratana Rajakanya Sirivadhana Phannavadi), born April 5, 1951 in Lausanne, Switzerland, is the eldest child of King Bhumibol Adulyadej and Queen Sirikit of Thailand. ... A style of office, or honorific, is a form of address which by tradition or law precedes a reference to a person who holds a title or post, or to the political office itself. ... Chulabhorn Walailak or Chulabhornwalailak, (born July 4, 1957 in Bangkok, is a Princess of Thailand, the youngest daughter of King Bhumipol Adulyadej and Queen Sirikit of Thailand. ...

The rules are also slightly complicated for the first two classes Chao Fa and Phra Ong Chao.

Royal Princes and Princesses

Holders of these titles are still considered royal as they are at most two generations down from a king. Collectively, those who are children of a king are called "Loog Luang" (ลูกหลวง -- 'royal children') and those who are grand-children of a king are called "Laan Luang" (หลานหลวง -- 'royal grand-children'). In English translation, they are normally called "princes". Special forms of language are also used when one wishes to speak to them, although the language is less elaborate than when speaking to the king or the queen. A male Loog Luang who does not accede to the throne would also start a new royal surname, which normally reflects his birth name (as opposed to an honorific name given later). The surname can be used by his wife if she is a commoner by birth, possibly with Na Ayudhya added if she has no noble title. It is otherwise not normally used until his children or grand-children first hold the title of Mom Chao, when the surname will first appear in their names.

Chao Fa (HRH Prince) (HRH Princess)

Chao Fa (เจ้าฟ้า) is the most senior class of the royal family after the royal couple. Traditionally, their mother must be a princess. Holders of this title actually consist of three classes: The Thai royal and noble titles signify distance of the bearers to the King. ...

1. Chao Fa of the First Class (เจ้าฟ้าชั้นเอก -- Chao Fa Chan Aeg). These are the princes/princesses born to the queen or to a royal consort who is also a Loog Luang or royal children. They would traditionally be referred to as "Tunkramom Chai(m)/Tunkramom Ying(f)" (ทูลกระหม่อมชาย/ทูลกระหม่อมหญิง), although nowadays they are more commonly called Chao Fa.
2. Chao Fa of the Second Class (เจ้าฟ้าชั้นโท -- Chao Fa Chan Tho). These are the princes/princesses born to a royal consort who is also a Laan Luang or royal grand children. They would traditionally be referred to as "Somdej Chai(m)/Somdej Ying(f)" (สมเด็จชาย/สมเด็จหญิง).
3. Chao Fa of the Third Class (เจ้าฟ้าชั้นตรี -- Chao Fa Chan Tri). These are the princes/princesses that are specially appointed or born to Krom Phrarachawangbowon (กรมพระราชวังบวร).

Five (5) persons currently hold Chao Fa rank (highest royal rank after the King and Queen):

• HRH Princess Galyani Vadhana (born 1923)(elder sister of HM King Bhumibol Adulyadej(Rama IX))

• HRH Prince Maha Vajiralongkorn (born 1952) (only son of King Rama IX)

• HRH Princess Maha Chakri Sirindhorn (born 1955) (2nd born daughter of King Rama IX)

• HRH Princess Chulabhorn (born 1957) (youngest daughter of King Rama IX)

• HRH Princess Bejaratana (born 1925) (daughter of the late King Rama VI)

[NOTE: Princess Ubol Ratana (eldest child of HM King Rama IX) lost her Chao Fa (HRH) title when she married commoner Peter Ladd Jensen].

Phra Ong Chao (HRH Prince)(HRH Princess)///(HH Prince)(HH Princess)

Phra Ong Chao (พระองค์เจ้า) is a lesser class of the princes/princesses than Chao Fa. They could be either:

Phra Chao Boromawongse Ther Phra Ong Chao (พระเจ้าบรมวงศ์เธอ พระองค์เจ้า)"His/Her Royal Highness" These are the princes/princesses who are of Phra Ong Chao rank (instead of higher Chao Fa rank) by birth (i.e., children of a king and a Chao Chom Manda (a consort who was born commoner)or who are specially promoted by a king to this high rank.

Phra Chao Worawongse Ther Phra Ong Chao (พระเจ้าวรวงศ์เธอ พระองค์เจ้า) "His/Her Royal Highness" Generally, these are the princes/princesses who are grandchildren of a king or who are specially promoted by a king to this rank. The categories are as follows:

• Children of a Chao Fa and a royal princess (Phra Ong Chao, or Mom Chao Ying). In turn, the children of this rank may hold the title of Mom Chao if royal permission is granted.

• Children of a Phra Chao Boromawongse Ther Phra Ong Chao and a royal princess whose rank is Phra Ong Chao.

• Mom Chao to whom the king granted a special promotion to become a Pra Chao Worawongse Ther Pra Ong Chao (e.g. Mom Chao Chula-Chakrabongse's appointment to Phra Chao Worawongse Ther Phra Ong Chao rank by H.M. King Rama VI). However, the children of this category of Phra Ong Chao will be treated as in the normal course as children of a Mom Chao and will hold the title of Mom Rajawongse.

Phra Worawong Ther Phra Ong Chao (พระวรวงศ์เธอ พระองค์เจ้า) "His/Her Highness". These are:

• Mom Chao whom the king granted this higher title, either as recognition of merit, or as a special favour. An example of this is Phra Worawong Ther Phra Ong Chao Nakkatra Mongkol Kromma Mhun Chandaburi Suranat, father of Queen Sirikit, who was born Mom Chao Nakkatra Mongkok Kitiyakorn (note that his surname is omitted now that he has become a Phra Ong Chao). This title is however personal to the recipient, and his children would still be treated as children of a Mom Chao as usual (i.e. inherit the title of Mom Rajawongse rather than Mom Chao).

• Children of a Somdej Chao Fa whose grandmothers were queens of Rama V received the royal permission of H.M. King Rama VII to hold the title of Phra Worawongse Ther Pra Ong Chao even though their mothers were commoners. An example of this is Phra Worawongse Ther Pra Ong Chao Bhumibhol Adulyadej, currently H.M. King Rama IX who is the son of Somdej Phra Boromawongse Ther Chao Fa Kroma Luang Songkhlanakarin and Mom Sangwal who was a commoner.

At least seven persons currently hold Phra Ong Chao rank (mid level royal rank) including:

• HRH Princess Bajrakitiyabha (born 1978)(daughter of The Crown Prince and HRH Princess Soamsavali)
• HRH Princess Siriwannawari (born 1987)(daughter of The Crown Prince and Mom Yuvadhida)
• HRH Prince Dipangkara (born 2005) (son of The Crown Prince and HRH Princess Srirasmi)
• HRH Princess Siribhachudhabhorn (born 1982)(daughter of HRH Princess Chulabhorn and Air Vice Marshall Virayudh)
• HRH Princess Adityadhornkitikhun (born 1984)(daughter of HRH Princess Chulabhorn and Air Vice Marshall Virayudh)
• HRH Princess Srirasmi (born 1971) (wife of The Crown Prince)
• HRH Princess Soamsavali (born 1957) (previous wife of The Crown Prince)

Mom Chao (HSH Prince)(HSH Princess)

Mom Chao(m)/Mom Chao Ying(f) (หม่อมเจ้า/หม่อมเจ้าหญิง, abbreviated in Thai as ม.จ.) is the most junior class still considered royalty. This is normally when surnames first appear among royal lineages. In English this rank is translated as "His or Her Serene Highness." They are either: This article or section does not cite any references or sources. ...

1. Children of a male Chao Fa and a commoner.
2. Children of a male Phra Ong Chao.

Informally, they are styled Than Chai(m).../Than Ying(f)... (ท่านชาย.../ท่านหญิง...).

There are a few dozen persons living as of 2007 who hold Mom Chao (most junior royal) rank, including:

HSH Prince Bhisatej RAJANI (born 1922) (son of HRH Prince Bidyalongkorn (a grandson of Vice-King Pinklao, who was a brother of King Rama IV) and younger brother of HSH Princess Vibhavadi RANGSIT (wife of HSH Prince Piya Rangsit, a grandson of King Rama V)). HSH Princess Vibhavadi Rangsit was posthumously elevated to the rank of HRH (Phra Ong Chao) following her tragic death in service to the country)

HSH Prince Pimai YUGALA (born 1978)(son of HRH Prince Bhanubandhu YUGALA, a grandson of King Rama V)

HSH Princess Ying Ying YUGALA (born 1981) (son of HRH Prince Bhanubandhu YUGALA, a grandson of King Rama V)

HSH Princess Sri Savangwongse YUGALA (born 1946)(daughter of HRH Prince Chalermbala YUGALA, a grandson of King Rama V)

HSH Prince Chalermsuk YUGALA (born 1950)(son of HRH Prince Chalermbala YUGALA, a grandson of King Rama V)

HSH Prince Dighambara YUGALA (born 1951)(son of HRH Prince Chalermbala YUGALA, a grandson of King Rama V)

HSH Princess Malini Mongol YUGALA (born 1940) (son of HRH Prince Anusara YUGALA, a grandson of King Rama V)

HSH Princess Padamon Rangsi YUGALA (born 1941) (daughter of HRH Prince Anusara YUGALA, a grandson of King Rama V)

HSH Prince Chatrichalerm YUGALA or YUKOL (born 1942) (son of HRH Prince Anusara YUGALA, a grandson of King Rama V) (he is a movie director, e.g. The Legend of Suriyothai and King Naresuan the Great)

HSH Prince Chulcherm Yugala YUGALA (born 1947) (son of HRH Prince Anusara YUGALA, a grandson of King Rama V)

HSH Princess Nobhadol Chalerm Sri YUGALA (born 1953) (daughter of HRH Prince Anusara YUGALA, a grandson of King Rama V)

The 'titled commoners'

More distant royal progeny, starting from the children of male Mom Chao, are considered commoners. However, these commoners have titles (or a surname suffix) to indicate that their ancestry can be traced back to a king.

Mom Rajawongse

Mom Rajawongse (หม่อมราชวงศ์, abbreviated in Thai as ม.ร.ว. and in English as M.R. and sometimes translated into English as "The Honorable") is the title assumed by children of male Mom Chao. The title is pronounced "Mom Rajawong". Informally, they may be styled as Khun Chai(m).../Khunying(f)... (คุณชาย.../คุณหญิง...). (Khunying is also a formal title given to commoner married ladies who have been granted at least the Order of Chulachomklao, Fourth Class.) Holders of this title are occasionally erroneously referred to as princes/princesses in older English translated older documents; it is more common these days to use the correct title of "Mom Rajawongse". This article or section does not cite any references or sources. ... This article or section does not cite any references or sources. ...

Mom Luang

Mom Luang (หม่อมหลวง, abbreviated in Thai as ม.ล. and sometimes in English as M.L. and sometimes translated into English as "The Honorable") are the last royal descendants still retaining a title. Mom Luang titles are conferred on children of male Mom Rajawongse. Colloquially, though incorrectly, they are sometimes addressed as "Mom"; the correct informal address is "Khun". This article does not cite any references or sources. ...

What happens after Mom Luang?

The children and subsequent descendants of male Mom Luang do not hold any title. However, they may append the word "Na Ayudhya" (ณ อยุธยา) to their surname, signifying a royal blood line.

Miscellaneous titles of royal descendants (obsolete)

Mom (royalty)

Mom (หม่อม) has a rather ill-defined status among the hierarchy of the royal titles. Holder of this title can be either:

• a person of Mom Rajawongse rank, who has been granted this "Mom" title by the king in recognition of his merit. Technically, this is a feudal lifetime title, equivalent to the title Phraya granted to commoners; it is thus written without a space. The title is granted together with a honorific name, and is used without a surname, for example: Mom Anuwatworapong (หม่อมอนุวัตรวรพงษ์), who was born as Mom Rajawongse Singhanad Pramoj (หม่อมราชวงศ์ สิงหนัด ปราโมช).
• a former prince whose title has been stripped off as a punishment. He would still be known as Mom [name].

Khun (courtesy title)

Khun (คุณ) is a courtesy title for children born to a noble mother who gave up her title to marry a man of lesser title. This is pronounced in lower tone, and not to be confused with Khun (ขุน), pronounced in higher tone, which is a feudal title. In modern days, this word is used informally to courteously address virtually everybody, apart from those who actually hold a title of Mom Rajawongse or higher.

Prince's wife's title (unless otherwise elevated by the Sovereign)

Wives of the princes also have titles. Again, this depends on the titles of both sides.

Phra Chaya

Phra Chaya (พระชายา) is a princess in her own right who is married to either Chao Fa or a Phra Ong Chao ranked royal prince(HRH Prince). She retains her own title. When referring to her as a wife of the prince, she may be called "Phra Chaya Nai [Husband's name]".

Chaya

Chaya (ชายา) is a princess in her own right who is married to a Mom Chao (HSH Prince). Again, she would retain her own title. When referring to her as a wife of the prince, she may be called "Chaya Nai [Husband's name]".

Mom (wife)

Mom (หม่อม) in this context is a commoner married to a prince. She will use this title to prefix her name and add the word Na Ayudhya to her new surname, for example: Mom Srirasmi Mahidol Na Ayudhya (a wife of Chao Fa Maha Vajiralongkorn, whose surname is Mahidol). Monument to Prince Vajiralongkorn Maha Vajiralongkorn (born July 28, 1952) is the only son of Bhumibol Adulyadej, King (Rama IX) of Thailand, and Queen Sirikit. ...

After the birth of HRH Prince Dipangkorn Rasmijoti, Mom Srirasmi Mahidol Na Ayudhya was elevated by King Rama IX to "Phra Ong Chao" rank (i.e., Phra Chao Worawong Ther Phra Ong Chao Srirasmi Phraworachaya nai Somdej Phraborom Orasathiraj Siammakut Rajakumari (HRH Princess Srirasmi, the Royal Consort of His Royal Highness Crown Prince Maha Vajiralongkorn)).

Feudal lifetime titles (largely all obsolete except female titles "Than Phu Ying" and "Khun Ying" as discussed below)

Feudal titles were granted until just after the 1932 Revolution brought an end to absolute monarchy, and for that matter, feudalism in Thailand. It is now largely obsolete, although on rare occasions, the king may still grant an (honorary) feudal title to a royal. The latest title granted was "Kromma Luang Narathiwat Rajanakarin" (translated as "Princess of Narathiwat", literally "Viscountess of Narathiwat, Ruler of the Royal City") to Princess Galyani Vadhana, the King's sister. Forms of government Part of the Politics series Politics Portal This box:      Absolute monarchy is a monarchical form of government where the monarch has the power to rule his or her land or country and its citizens freely, with no laws or legally-organized direct opposition in force. ... Roland pledges his fealty to Charlemagne; from a manuscript of a chanson de geste Feudalism, a term first used in the early modern period (17th century), in its most classic sense refers to a Medieval European political system comprised of a set of reciprocal legal and military obligations among the... Narathiwat (Thai นราธิวาส) is one of the southern provinces (changwat) of Thailand. ... HRH Princess Galyani Vadhana, (born 6 May 1923, London, England), is a Princess of Thailand, the eldest sister of King Bhumibol Adulyadej (Rama IX). ...

The full title granted consists of a prefix, which signifies the rank (บรรดาศักดิ์ - Bandasak), and an honorific name (ราชทินนาม - Rachatinnanam), which can well be recycled. Taking the above example, the rank was "Luang" and the honorific name was "Narathiwat Rajanakarin". The appointee would use the full title in place of his names. However, as the honorific name can be repeated, when referring to a previous title holder, his former name may be written in a bracket to avoid confusion, for example: Phraya Kosathibodi (Lek) and Phraya Kosathibodi (Pan).

It is again a bit more complicated with the Chao Fa and Phra Ong Chao. If given a feudal title, they are said to "Song Krom" (ทรงกรม - lit.: "take department", but probably more semantically related to "take office"). The title is prefixed with the word "Krom" (which will be pronounced "Kromma" when forming part of the name), appended to (not replacing) the former princely title. For example, the full title of the King's sister is "Somdej Phra Chao Pheenang Ther Chao Fa Galyani Vadhana Kromma Luang Narathivat Rajanakarin. Nevertheless, it is the princely title which will be more frequently omitted when contracting the title e.g. Somdej Phra Chao Boromawong Ther Kromma Phraya Damrong Rajanubhab (born Phra Ong Chao Disuankumaan). There are 5 feudal titles for prince/princess HRH Prince Damrong Rajanubhab (Thai including his full title: สมเด็จพระเจ้าบรมวงศ์เธอ กรมพระยาดำรงราชานุภาพ) (June 21, 1862 – December 1, 1943) was the founder of the modern Thai education system as well as the modern provincial administration. ...

1. Somdej Krom Phraya (from Rama VI) or Krom Somdej Phra (Rama IV - Rama V) (สมเด็จกรมพระยา หรือ กรมสมเด็จพระ)
2. Krom Phra (กรมพระ)
3. Kromma Luang(กรมหลวง)
4. Kromma Knun (กรมขุน) Chao Fa starts from this title
5. Kromma Muen (กรมหมื่น) Phra Ong Chao starts from this title

Since the time of King Chulalongkorn, the honorific titles given to the royalties normally incorporate a city name or its modified form, and the holders are known in English as the Prince/Princess of that city.

Feudal titles are not inheritable.

Feudal lifetime titles for male commoners (obsolete)

These titles are given only to males and not inheritable.

Somdej Chao Phraya

Somdej Chao Phraya (สมเด็จเจ้าพระยา) is the most senior among the ranks. It is awarded under extraordinary circumstances only to those with great achievements. This title is equivalent to that of a prince.

There have only been 4 persons in Siam's history to be elevated to this title. The first was granted by King Taksin of Thonburi to Chao Phraya Chakri who later become King Rama I of Bangkok; two were granted by King Rama IV; and the last was granted by King Rama V.

Chao Phraya

Chao Phraya (เจ้าพระยา) is the most senior rank commonly granted. It is normally bestowed upon commners who served as Ministers of State. Holders of this title are informally addressed and referred to as "Chao Khun" (เจ้าคุณ) (2nd person: Chao Khun; 3rd person: Chao Khun + [honorific name]).

Phraya

Phraya (พระยา) is next in term of seniority. Similar to Chao Phraya, holders of this title are also informally addressed and referred to as "Chao Khun" (เจ้าคุณ).

Phra and Jamhun (or Phranai)

Phra (พระ) is further down the line. Holders of this title are informally addressed and referred to as "Khun Phra" (คุณพระ) (2nd person: Khun Phra; 3rd person: Khun Phra + [honorific name]). Jamhun (จมื่น หรือ พระนาย) is a senior title equivalent to Phara, given only to the Head of the king's servants (มหาดเล็ก).

Luang

Luang (หลวง). Still further down the line, holders of this title are informally addressed and referred to as "Khun Luang" (คุณหลวง) (2nd person: Khun Luang; 3rd person: Khun Luang + [honorific name]).

Khun

Khun (ขุน). This is pronounced with higher tone (as oppose to Khun (คุณ) in lower tone). Informally, they are addressed as "Than Khun" (ท่านขุน). The last living holder of the title was believed to be Pol Maj-Gen Khun Phantharak Rajadej (Butr Phantharak) who died in 2006, age 103.

Mhun

Mhun (หมื่น) is one of the lower ranks, usually held by relatively junior officers.

Pan

Pan (พัน), a yet lower rank, and not considered very noble. This title is held by junior officers, especially those in rural areas.

Nai

Nai (นาย), one step up from being a Prai (ไพร่ -- plain commoner). This is the most junior among the ranks, and is not normally considered noble.

Feudal lifetime titles for female commoners (still in use)

The title for women who are commoners used to be Thao (ท้าว).

For example, Thao Thepkrasattri, Thao Seesunthon, and Thao Suranaree, are famous heroines in Thai history. This title is no longer in use. Chan and Mook were two sisters who lived in Siam in the late nineteenth century. ... Chan and Mook were two sisters who lived in Siam in the late nineteenth century. ... Statue of Thao Suranaree in Khorat city centre. ...

King Rama V created the titles currently in use for women. The present King (Bhumibhol, King Rama IX), usually, grants the titles for women on the his coronation day (5 May) every year. These are the only titles for commoners that have survived in modern day usage, since the titles for men are no longer in use. King Chulalongkorn the Great or Rama V (royal name: Phra Chula Chomklao Chaoyuhua; Thai: ) (September 20, 1853 – October 23, 1910) was the fifth king of the Chakri dynasty of Thailand. ... is the 125th day of the year (126th in leap years) in the Gregorian calendar. ...

Than Phu Ying

Than Phu Ying (ท่านผู้หญิง) is the highest title for a woman and is equivalent to the British title of Dame.

Khun Ying

Khun Ying (คุณหญิง) is a title for married woman lower than Than Phu Ying. An unmarried woman is styled Khun (คุณ). It is equivalent to the British title of Lady. A lady is a woman who is the counterpart of a lord; or, the counterpart of a gentleman. ...

References

• Jones Robert B., 1971, Thai Titles and Ranks, Including a Translation of Royal Lineage in Siam by King Chulalongkorn, Data Paper No. 81. Ithaca: Southeast Asia Program, Department of Asian Studies, Cornell University
• Finestone Jeffrey, 1989, The Royal Family of Thailand: The Descendants of King Chulalongkorn
• Rabibhadana M.R. Akin, 1996, The Organization of Thai Society in the Early Bangkok Period 1782 - 1873