Definitions for "Tetrarchy"
The district under a Roman tetrarch; the office or jurisdiction of a tetrarch; a tetrarchate.
Rule by four. A type of Roman government established in the late 3rd century A.D. by Diocletian in an attempt to share power with potential rivals.
Founded by Diocletian, this was an imperial system of rule where the empire was ruled by two Augusti and two Caesars