Tetrarch

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

2. (a.) Four.

Thesaurus Entries

Dalai Lama, Holy Roman Emperor, Inca, Kaiser, ardri, beg, beglerbeg, burgrave, cacique, caesar, cham, collector, czar, dey, eparch, exarch, gauleiter, governor, governor-general, kaid, khan, khedive, lieutenant governor, mikado, nabob, nawab, negus, padishah, palatine, pendragon, pharaoh, proconsul, provincial, rig, sachem, sagamore, satrap, shah, sheikh, shogun, stadtholder, subahdar, tenno, tetrarch, tycoon, vali, vice-king, viceroy, wali