Frederick III or IV (1 September 1341- 27 January 1377), called the Simple, King of Sicily from 1355 to 1377, was the second son of Peter II of Sicily and Elisabeth of Carinthia. He succeeded his brother Louis. The documents of his era call him the "infante Frederick, ruler of the kingdom of Sicily," without any regnal number. September 1 is the 244th day of the year (245th in leap years). ... Events The Queens College, a constituent college of the University of Oxford, is founded. ... January 27 is the 27th day of the year in the Gregorian calendar. ... // Events January 17 – Pope Gregory XI enters Rome. ... The following is a list of monarchs of Naples and Sicily: See also: List of Counts of Apulia and Calabria Hauteville Counts of Sicily, 1071-1130 Roger I 1071-1101 Simon 1101-1105 Roger II 1105-1130 Hauteville Kings of Sicily, 1130-1198 Roger II 1130-1154 William I 1154... Events January 7 - Portuguese king Afonso IV sends three men to kill Ines de Castro, beloved of his son prince Pedro - Pedro revolts and incites a civil war. ... // Events January 17 – Pope Gregory XI enters Rome. ... Peter II (July 1305-15 August 1342, Calascibetta) was crowned king of Sicily (then called Trinacria) in 1321 and gained full sovereignty when his father died in 1337. ... Elisabeth or Elizabeth (1298 – after 1347) was the daughter of Otto III of Carinthia and Tyrol (also numbered as Otto II) by his wife Euphemia of Silesia-Liegnitz. ... Louis the Child (1337-16 October 1355) was king of Sicily, then called Trinacria, from 1342 to 1355. ... Ordinal numbers or regnal numbers are used to distinguish between persons with the same name who held the same office. ...

"Frederick the Simple" is often confused with an earlier Sicilian monarch, Frederick II, who chose to call himself "Frederick III", even though he was actually only the second King Frederick to occupy the Sicilian throne, as also this Fredrick has been dubbed by later generations of genealogists and historians as Frederick III. Frederick III (or II) (1272 – 1337), King of Sicily, was the third son of King Peter III of Aragon and Sicily, and of Constance, daughter of Manfred. ...

The beginning of Frederick III's reign was plagued by intermittent wars with the Kingdom of Naples and also by the Black Death, to which his elder brother and predecessor had succumbed. In 1372 he was able to come to peace terms with Naples and the Papacy and was titled as a Tributary King of "Trinacria." The Kingdom of Naples was born out of the division of the Kingdom of Sicily after the Sicilian Vespers rebellion of 1282. ... It has been suggested that Plague doctor be merged into this article or section. ... In this year, the city of Aachen, Germany begins adding a Roman numeral Anno Domini date to a few of its coins. ... The Pope is the Catholic Bishop and patriarch of Rome, and head of the Roman Catholic Church and the Eastern Catholic Churches. ...

He appointed his uncle, Roland, to act on his behalf in the Duchy of Athens and Neopatria. Roland or Orlando (1296 – 1361) was the second-eldest illegitimate son of Frederick III of Sicily by his concubine Sibilla di Sormella. ... // Duchy of Athens A small crusader state which was established after the Sack of Constantinople (1204) by the Crusaders. ... Coat of Arms of the Duchy of Neopatras The Duchy of Neopatria or of Neopatras was one of the Crusader States set up in Greece after the conquest of the Byzantine Empire during the Fourth Crusade. ...

On 11 April 1361, Frederich married his first wife Constança of Aragon, daughter of Peter IV of Aragon. They had only one daughter, Mary. On 17 January 1372, Frederick married secondly Antonia of Balzo. There were no children from this marriage. April 11 is the 101st day of the year in the Gregorian calendar (102nd in leap years). ... Founding of the University of Pavia, Italy. ... Constança of Aragon (1343 - 2 July/18 July 1363) was the first Queen consort of Frederick III the Simple. ... Peter IV of Aragon (1319-1387), king of Aragon (1336-1387), the Ceremonious or el del punyalet (the one of the little dagger). ... Mary of Sicily (c 1370—1402), Queen of Sicily, was the daughter and heir of Frederick III The Simple. As she was very young at the time of her fathers death, her government was effectively taken over by four baronial families who styled themselves vicars. ... January 17 is the 17th day of the year in the Gregorian calendar. ... In this year, the city of Aachen, Germany begins adding a Roman numeral Anno Domini date to a few of its coins. ... Antonia of Balzo (c. ...