Patr. of Constantinople. A native of Alexandria, he was sent by St Cyril to Constantinople and elected bishop when Flavian was deposed in 449. Pope Leo I demanded that he should condemn Eutyches and Nestorius and endorse the Tome of Leo; Anatolius agreed in 450. He seems to have encouraged the Emp. Marcian to summon the Council of Chalcedon and had some part in formulating the Definition of Chalcedon.