Tetrarch

Tetrarch , noun

[Latin tetrarches, Greek {not transcribed}, {not transcribed}; te`tra- (see Tetra-) + {not transcribed} a ruler, {not transcribed} to lead; rule: compare French tétrarque. See Arch, a.]

(Rom. Antiquities) A Roman governor of the fourth part of a province; hence, any subordinate or dependent prince; also, a petty king or sovereign.

Tetrarch , adjective

Four. [Obsolete] — Fuller