Patr. of Moscow from 1652 to 1658. He sought to revise the Russian liturgy by bringing the prescriptions of the service books into conformity with Greek usage and to eradicate corruptions. He settled such details as the making of the sign of the cross with three fingers instead of two and the use of the threefold Alleluia. In 1658 he fell from imperial favour and resigned. He tried to regain his position, but at the Council of Moscow in 1667 he was deposed and banished, though his liturgical reforms were sanctioned.