Reigned from 862 to 872. Born c.792 in Rome, Italy. Before receiving minor orders he had married, and his wife and daughter were slain by Eleutherius who had forcefully married the latter. He strove to maintain peace among Charlemagne’s descendants and compelled King Lothair of Lorraine to take back his lawful wife. Through the Council of Constantinople (869) he effected the restoration of unity between East and West. He supported Saints Cyril and Methodius in their evangelization of the Slavs, and approved their rendering of the liturgy into Slavonic.