TETRARCH
Etymology
Noun
tetrarch (plural tetrarches)
a governor of part of a country, especially of a fourth part of a province in Ancient Rome
an officer in charge of a fourth part of a phalanx in Ancient Greece
Source: Wiktionary
Te"trarch, n. Etym: [L. tetrarches, Gr. Tetra-) + tétrarque. See
Arch, a.] (Rom. Antiq.)
Definition: A Roman governor of the fourth part of a province; hence, any
subordinate or dependent prince; also, a petty king or sovereign.
Te"trarch, a.
Definition: Four. [Obs.] Fuller.
Source: Webster’s Unabridged Dictionary 1913 Edition