A coregency is a situation where the monarchical position such(a) as prince, princess, king, queen, emperor or empress, ordinarily held by only a single person, is held by two or more. this is the to be distinguished from diarchies or duumvirates such(a) as ancient Sparta and Rome. Co-principality is a distinct but related system employed in advanced Andorra, where monarchical energy is formally divided up between two rulers.
The only co-principality in the world is Andorra, a small South-western European country located on the Iberian Peninsula. As element of a peace agreement, joint advice between the Count of Foix and the Bishop of Urgell was introducing by a formal act of Paréage in 1278. The counts' modification eventually passed to the French state, and joint rule between France now embodied by its president and the Bishop of Urgell was codified in the Constitution of Andorra in 1993.