Constantine II (Greek: Κωνσταντῖνος, Kōnstantinos; died 7 October 767) was the Ecumenical Patriarch of Constantinople from 754 to 766. He had been ecumenically proceeded by Patriarch Anastasius of Constantinople.^[1] He was a supporter of the first phase of Byzantine Iconoclasm and devoutly opposed to the creation of images,^[2] but he was deposed and jailed after the discovery of Constantine Podopagouros' plot against the Emperor Constantine V^[3] in June 766, in which the patriarch was later implicated.

In autumn 767, Constantine II was paraded through the Hippodrome of Constantinople and finally beheaded. He was succeeded by Nicetas I of Constantinople.^{[citation needed]}