is a Greek
term meaning "ruler of a quarter" for a holder of Imperial
office under a Tetrarchy
. It was applied earlier to rulers of minor principalities owing allegiance to Rome.
It can also refer, more loosely, to
- A provincial governor in a country composed of several smaller parts.
- A subordinate or dependent prince, or petty sovereign. For example, the Tetrarchs of Roman Palestine, such as Herod Antipas, were tributary kings (Matt. 14:9).
- A Macedonian officer in charge of a unit associated with the number four (tetra), such as a quarter of a larger unit (such as a phalanx, or in one case a 'company' of 64 footmen), or comprising four smaller units (in one case 4 lochoi, each under a lochagos).
- A Roman military rank, similar to the previous Greek usage
- A British light tank of World War II, see Tetrarch tank
- Tetrarch (Well of Echoes), a book by Ian Irvine, part of the Well of Echoes series
- Encyclopedia, MS Encarta 2001, under article "Tetrarch".