Constantine I of Constantinople (Greek: Κωνσταντῖνος; died 9 August 677) was the Ecumenical Patriarch of Constantinople from 675 to 677. He is listed as a saint, feast day 29 July. He was preceded by John V of Constantinople. He was succeeded by Theodore I of Constantinople.

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Titles of Chalcedonian Christianity
Preceded byJohn VEcumenical Patriarch of Constantinople 675 – 677Succeeded byTheodore I