despot
des.pot \'des-p*t, -.pa:t\ n [MF despote, fr. Gk despote-s; akin to Skt dampati lord of] the house; both fr. a prehistoric IE compound whose constituents are akin to L domus house and to L potis able - more at TIMBER, POTENT 1a: a Byzantine emperor or prince 1b: a bishop or patriarch of the Eastern Orthodox Church 1c: an Italian hereditary prince or military leader during the Renaissance 2a: a ruler with absolute power and authority : AUTOCRAT 2b: a person exercising power abusively, oppressively, or tyrannously
Webster's English Dictionary