The Fourth Council of Constantinople (Roman Catholic) was the 8th Catholic Ecumenical Council held in Constantinople from October 5, 869 to February 28, 870. The Council met in 10 sessions from October 869 to February 870 and issued 27 canons. The council was called by Emperor Basil I the Macedonian and Pope Adrian II. It deposed Photios, a layman who had been appointed as Patriarch of Constantinople, and reinstated his predecessor Ignatius.