What is "tetrarch"

Tetrarch \Te"trarch\, a. Four. [Obs.]
--Fuller.

Tetrarch \Te"trarch\, n. [L. tetrarches, Gr. ?, ?; te`tra- (see Tetra-) + ? a ruler, ? to lead; rule: cf. F. t['e]trarque. See Arch, a.] (Rom. Antiq.) A Roman governor of the fourth part of a province; hence, any subordinate or dependent prince; also, a petty king or sovereign.

late Old English tetrarche "ruler of one of four divisions of a kingdom or province," from Late Latin tetrarcha, from tetrarches, from Greek tetrarkhes "leader of four companies, ruler of four provinces," from tetra- "four" (see tetra-) + arkhein "to rule" (see archon). Applied generally to subordinate rulers in the Roman Empire, especially in Syria. Related: Tetrarchy.

n. 1 a governor of part of a country, especially of a fourth part of a province in Ancient Rome 2 an officer in charge of a fourth part of a phalanx in Ancient Greece

Tetrarch may refer to:

• Tetrarchs, 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
• Tetrarchy (Judea), formed by the sons of Herod the Great
• Tetrarch (Greek rank)
• Tetrarch (Macedonian rank)
• Tetrarch (novel), a 2003 novel by Ian Irvine
• Tetrarch tank, a British light tank of World War II
• The Tetrarch, a Thoroughbred racehorse
• The Tetrarchs of Ancient Thessaly 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 thrash metal band from Atlanta, Georgia

Tetrarch is the second novel in Ian Irvine's The Well of Echoes quartet.

Tetrarch is an American thrash metal band from Atlanta, Georgia, that was formed in 2007. They are now located in Los Angeles, Ca. They have released three EPs; their newest is entitled Relentless, which was released on March 19, 2013.