
1) Ancient Roman title
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https://www.crosswordclues.com/clue/interrex

The Interrex (plural interreges) was literally a ruler `between kings` (Latin inter reges) during the Roman Kingdom and the Roman Republic. He was in effect a short-term regent. The office of interrex was supposedly created following the death of Rome`s first king Romulus, and thus its origin is obscured by legend. The Senate of the Roman Kingd......
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http://en.wikipedia.org/wiki/Interrex
[Poland] The institution of interrex existed in the Crown of the Kingdom of Poland, whose ruling classes liked to view their Republic (Rzeczpospolita) or Commonwealth as an heir to Roman republican traditions. The Commonwealth`s monarch holding a double title of the Two Nations King of Poland and Grand Duke of Lithuania entered upon their o...
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http://en.wikipedia.org/wiki/Interrex_(Poland)

one who rules during an interregnum; regent
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http://phrontistery.info/i.html

• (n.) An interregent, or a regent.
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http://thinkexist.com/dictionary/meaning/interrex/

in ancient Rome, a provisional ruler specially appointed for a period during which the normal constituted authority was in abeyance (the ...
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http://www.britannica.com/eb/a-z/i/33

In ancient Rome in the time of the kings (traditionally before 510 BC), an official appointed by the senators on the death of a king to hold supreme authority until the election of his successor....
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http://www.encyclo.co.uk/local/20688

During the late Republic the interrex served for 5 days and took over the duties of the consuls and held elections for consuls. They were appointed from the pool of senators by the Senate, when the state was without consuls due to death or other causes.
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http://www.encyclo.co.uk/visitor-contributions.php
In'ter·rex` noun ;
plural English
Interrexes , Latin
Interreges . [ Latin , from
inter between +
rex king.] An interregent, or a regent.
Found on
http://www.encyclo.co.uk/webster/I/83

a person holding supreme authority in a state during an interregnum.
Found on
https://www.infoplease.com/dictionary/interrex
No exact match found.