Tetrarch, Tetrarchs, or Tetrarchy may refer to: *

Tetrarchy The Tetrarchy was the system instituted by Roman emperor Diocletian in 293 AD to govern the ancient Roman Empire by dividing it between two emperors, the ''augusti'', and their juniors colleagues and designated successors, the '' caesares'' ...

, the four co-emperors of the Roman Empire instituted by the Emperor Diocletian * Portrait of the Four Tetrarchs - a sculpture of the four co-emperors of the Roman Empire * Herodian Tetrarchy, formed by the sons of Herod the Great * Tetrarch, Military rank#Greek ranks in ancient Greek armies * ''Tetrarch'' (novel), a 2003 novel by Ian Irvine * Light Tank Mk VII Tetrarch, a British light tank of World War II *

The Tetrarch The Tetrarch (1911–1935) was an Irish-bred, British-trained Thoroughbred racehorse. He was undefeated in a racing career of seven starts and was voted the best British-trained two-year-old of the 20th century according to the National Horse ...

, a Thoroughbred racehorse * The Tetrarchs of

Ancient Thessaly Thessaly or Thessalia ( Attic Greek: , ''Thessalía'' or , ''Thettalía'') was one of the traditional regions of Ancient Greece. During the Mycenaean period, Thessaly was known as Aeolia, a name that continued to be used for one of the major tribe ...

under Philip II of Macedon * The Tetrarchs of Galatia in Asia Minor * Tetrarches, a rank in the Byzantine army * ''Tetrarch'', a 1981 fantasy novel by Alex Comfort * Tetrarch (band), a nu metal band from Atlanta, Georgia * Tetrarchy, a subdivision of the

Royal Phalanx The Royal Phalanx ( el, Βασιλική Φάλαγξ) was a military body composed of veteran officers of the Greek War of Independence, established on 18 September 1835. The Phalanx entailed military garrison duties, but mostly it was an honorifi ...

in 19th-century Greece * HMS ''Tetrarch'' is the name of the two vessels that have served in the

Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by Kingdom of England, English and Kingdom of Scotland, Scottish kings from the early medieval period, the first major maritime engagements were foug ...

See also