Interrex or "inter-rex" (Latin; plural, interreges) was literally a ruler "between kings." He was in effect a short-term regent. A regent is an acting governor. ...

Roman

• The institution of interrex originated in the Kingdom of Rome. When a king died, the Roman Senate appointed an interrex to serve for an indefinite period (usually less than a year). The interrex could nominate whomever he wished to the Roman Assembly, which then elected a king. As soon as the new king entered upon his office, the position of interrex was vacated.

• The institution of interrex, with some modifications, was carried over into the Roman Republic. If no consuls had been elected by New Year's Day, for whatever reason (e.g., civil strife, filibustering), a patrician senator was elected (or appointed) by the Senate to serve as interrex for five days. After that, another such interrex was elected, again for five days. The second interrex was charged with organizing new elections. If still no elections had been held, further new interreges were appointed every five days until they had been held.

There were seven traditional Kings of Rome before the establishment of the Roman Republic. ... The Roman Senate (Latin, Senatus) was a deliberative body which was important in the government of both the Roman Republic and the Roman Empire. ... The Roman Republic (Latin: Res Publica Romanorum) vested formal governmental powers in four separate assemblies — the Comitia Curiata, the Comitia Centuriata, the Comitia Tributa, and the Concilium Plebis. ... See also Roman Republic (18th century) and Roman Republic (19th century) The Roman Republic (Latin: Res Publica Romanorum) was the representative government of Rome and its territories from 510 BC until the establishment of the Roman Empire, sometimes placed at 44 BC (the year of Caesars appointment as perpetual... For modern diplomatic consuls, see Consulate general. ... This article is about January 1st in the Gregorian calendar. ... Filibuster can mean a legislative tactic. ... Patricians (patricii) were originally the elite caste in ancient Rome. ... A senate is a deliberative body, often the upper house or chamber of a legislature. ...

modern

A similar institution of interrex later existed in the Polish-Lithuanian Commonwealth, whose ruling classes liked to view their Republic (Rzeczpospolita) or Commonwealth as an heir to Roman republican traditions. The Commonwealth's kings entered upon their office by free election, which often led to a relatively long interregnum. Traditionally the role of interrex fell since 1572 to the Archbishop of Gnesen = Gniezo, as primate of the Roman Catholic Church in Poland. Wikipedia does not have an article with this exact name. ... Election of Michal Korybut Wisniowiecki as king of Poland at Wola, outside Warsaw ( 1669). ... An interregnum is a period between kings, or between popes of the Roman Catholic Church. ... Motto: none Voivodship Greater Poland Municipal government Mayor Jaromir Dziel Area 40,9 km² Population  - city  - urban  - density 71 040 none 1737/km² Founded City rights 8th century 1239 Latitude Longitude 52°32 N 17°36 E Area code +48 61 Car plates PGN Twin towns Anagni, Esztergom, Falkenberg, Saint... A primate in the Western Church is an archbishop or bishop who has authority not just over the bishops of his own province, as a Metropolitan does, but over a number of provinces, such as a national church. ... Saint Peters Basilica in Rome. ...