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 junior colleagues and designated successors, the ''caesares''. I ...

, the four co-emperors of the Roman Empire instituted by the Emperor Diocletian *

Portrait of the Four Tetrarchs The Portrait of the Four Tetrarchs is a porphyry sculpture group of four Roman emperors dating from around 300 AD. The sculptural group has been fixed to a corner of the façade of St Mark's Basilica in Venice, Italy since the Middle Ages. It ...

- a sculpture of the four co-emperors of the Roman Empire * Herodian Tetrarchy, formed by the sons of Herod the Great * Tetrarch,

Military rank Military ranks is a system of hierarchy, hierarchical relationships within armed forces, police, Intelligence agency, intelligence agencies, paramilitary groups, and other institutions organized along military organisation , military lines, such ...

in ancient Greek armies * ''Tetrarch'' (novel), a 2003 novel by Ian Irvine *

Light Tank Mk VII Tetrarch The light tank Mk VII (A17), also known as the Tetrarch, was a British light tank produced by Vickers-Armstrongs in the late 1930s and used during the Second World War. The Tetrarch was the latest in the line of light tanks built by the compan ...

, a British light tank of World War II *

The Tetrarch The Tetrarch (1911–1935) was an Irish-bred, British-trained Thoroughbred horse racing, 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 Na ...

, 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 Greece, Mycenaean period, Thessaly was known as Aeolia, a name that continued to be used for one of ...

under Philip II of Macedon * The Tetrarchs of

Galatia Galatia (; , ''Galatía'') was an ancient area in the highlands of central Anatolia, roughly corresponding to the provinces of Ankara and Eskişehir in modern Turkey. Galatia was named after the Gauls from Thrace (cf. Tylis), who settled here ...

in Asia Minor * Tetrarches, a rank in the

Byzantine army The Byzantine army was the primary military body of the Byzantine Empire, Byzantine armed forces, serving alongside the Byzantine navy. A direct continuation of the East Roman army, Eastern Roman army, shaping and developing itself on the legac ...

* ''Tetrarch'', a 1981 fantasy novel by

Alex Comfort Alexander Comfort (10 February 1920 – 26 March 2000) was a British scientist and physician, writer and activist, known best for his nonfiction sex manual, '' The Joy of Sex'' (1972). He was a poet and author of both fiction and nonficti ...

* Tetrarch (band), a nu metal band from Atlanta, Georgia * Tetrarchy, a subdivision of the

Royal Phalanx The Royal Phalanx () 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 honorific appointment, and a means to sust ...

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

Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...

See also