Peter of Constantinople

{{Short description|Ecumenical Patriarch of Constantinople from 654 to 666}}

{{Use dmy dates|date=January 2025}}

{{Infobox patriarch

| name = Peter of Constantinople

| patriarch_of = Ecumenical Patriarch of Constantinople

| image =

| caption =

| ordination =

| consecration =

| enthroned = 9 June 654

| ended = 12 October 666

| province =

| diocese =

| see =

| church =

| predecessor = Pyrrhus of Constantinople

| successor = Thomas II of Constantinople

| birth_name =

| birth_date =

| birth_place =

| death_date = 12 October 666

| death_place =

| buried =

| nationality =

| religion = Chalcedonian Christianity

}}

Peter of Constantinople (Greek: Πέτρος; died 12 October 666) was the Ecumenical Patriarch of Constantinople from 9 June 654 to 666. He was condemned as a heretic in the Third Council of Constantinople.{{Cite CE1913 |wstitle=Third Council of Constantinople}} He was succeeded as ecumenical patriarch by Thomas II of Constantinople.{{Cite web |url=https://www.patriarchate.org/list-of-ecumenical-patriarchs?p_p_id=101_INSTANCE_u1pdiOuFkFSc&p_p_lifecycle=0&p_p_state=normal&p_p_mode=view&p_p_col_id=column-1&p_p_col_pos=1&p_p_col_count=2&_101_INSTANCE_u1pdiOuFkFSc_delta=20&_101_INSTANCE_u1pdiOuFkFSc_keywords=&_101_INSTANCE_u1pdiOuFkFSc_advancedSearch=false&_101_INSTANCE_u1pdiOuFkFSc_andOperator=true&p_r_p_564233524_resetCur=false&_101_INSTANCE_u1pdiOuFkFSc_cur=14 |title=Ecumenical Patriarch}}

Peter succeeded patriarch Pyrrhus who also was a Monothelite. In correspondence with Pope Vitalian of Rome following Vitalian's ascension to the see of Rome, Peter was noncommittal concerning Monothelitism, leading to a restoration of ecclesiastical intercourse between Rome and Constantinople. This resulted the addition of Vitalian's name on the diptychs of the church in Constantinople – the only name of a pope so entered between the reign of Pope Honorius I, who died in 638, and 677 when Patriarch Theodore I of Constantinople removed the pope's name prior to the Third Council of Constantinople. At the council Peter was condemned as a heretic along with Patriarchs Sergius I, Pyrrhus and Paul II all of Constantinople, Patriarch Cyrus of Alexandria, and Theodore of Raithu.{{cn|date=August 2023}}