noun
- Plural of pentarch; rulers or leaders of five divisions or regions; members of a pentarchy.
Usage: historical; formal
Examples
- The pentarchs of the ancient empire each governed one of the five provinces.
- In the Byzantine system, pentarchs held authority over the major patriarchates.
- The five pentarchs met to discuss matters affecting all their territories.
- Historical records describe how the pentarchs maintained balance among their regions.