A ruler of other rulers.
A feudal lord directly owed rent or personal service by a tenant of subinfeudated land, a tenant's liege lord.
Anyone with overarching power or authority in a given domain.
To rule over; to domineer.
A governor or ruler of a quarter of a country, especially of a fourth part of a province in or client state of Ancient Rome.
An officer in charge of a fourth part of a phalanx in Ancient Greece.
Each of the four members of a jointly ruling tetrarchy, notably of the Roman Empire since Diocletian.