Synonyms:
warlord
Meaning: supreme military leader exercising civil power in a region especially one accountable to nobody when the central government is weak
Usage examples
In the council chamber of John Carter, Warlord of Mars, was Tardos Mors, Jeddak of Helium; Mors Kajak, his son, Jed of Lesser Helium; Carthoris, and a score of the great nobles of the empire.
Bear with you the authority of the Warlord of Barsoom, and of the Jeddak of Helium to offer every resource of the allied powers to assist Thuvan Dihn to recover his daughter and punish her abductors, whomsoever they may be.