
1) Form of government
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https://www.crosswordclues.com/clue/tetrarchy

The term `tetrarchy` (from the Greek τετραρχία `leadership of four [people]`) describes any form of government where power is divided among four individuals, but in modern usage usually refers to the system instituted by Roman Emperor Diocletian in 293, marking the end of the Crisis of the Third Century and the recovery of the Roman E...
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http://en.wikipedia.org/wiki/Tetrarchy
[Judea] The Tetrarchy of Judea, one of the Herodian Tetrarchies, was formed following the death of Herod the Great in 4 BCE, when his kingdom was divided between his sons as an inheritance. Judea, the major section of the tetrarchies, was transformed by Rome in 6 CE, abolishing the rule of Herod Archelaus, and forming the Province of Judea ...
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http://en.wikipedia.org/wiki/Tetrarchy_(Judea)

government by four people
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http://phrontistery.info/t.html

• (n.) The district under a Roman tetrarch; the office or jurisdiction of a tetrarch; a tetrarchate.
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http://thinkexist.com/dictionary/meaning/tetrarchy/

Literally, rule by four, this was the Imperial system of rule founded by Diocletian, where the Empire was ruled by two Augusti and two Caesars. It lasted HOW LONG?
Found on
http://www.encyclo.co.uk/visitor-contributions.php
Tet'rarch·y noun ;
plural Tetrarchies . [ Latin
tetrarchia , Greek ...: confer French
tétrarchie .]
(Rom. Antiq.) The district under a Roman tetrarch; the office or jurisdiction of a tetrarch; a tetrarchate.
Found on
http://www.encyclo.co.uk/webster/T/35

tetrarchy, tetradarchy A government by four persons jointly; a set of four tetrarchs or rulers; a country divided into four petty governments.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2780/7
No exact match found.