tetrarchy

Meanings

1. A government where power is shared by four people, especially (historical) the Herodian tetrarchy established in Judea after the death of Herod and the Tetrarchy of Diocletian which ruled the Roman Empire in the years 293-313.
2. The land ruled by such a government, either together or separately.

Etymology

From Latin tetrarchia, from Ancient Greek τετραρχία (tetrarkhía), from τετρα- (tetra-, “four”) + -αρχία (-arkhía, “-archy: rule”), equivalent to tetra- + -archy.