John Chrysostom (349– ca. 407), Greek: Ιωάννης ο Χρυσόστομος, Ioannes Chrysostomos) was the archbishop of Constantinople. He is known for his eloquence in preaching and public speaking, his denunciation of abuse of authority by both ecclesiastical and political leaders, the Liturgy of St. John Chrysostom, and his ascetic sensibilities. After his death he was given the Greek surname chrysostomos, "golden mouthed", rendered in English as Chrysostom.
The Orthodox Church and Eastern Catholic Churches honor him as a saint (feast day, November 13) and count him among the Three Holy Hierarchs (feast day, January 30), together with Saints Basil the Great and Gregory the Theologian. He is recognized by the Roman Catholic Church as a saint and a Doctor of the Church. Churches of the Western tradition, including the Roman Catholic Church, the Church of England, and the Lutheran church, commemorate him on September 13. His relics were looted from Constantinople by Crusaders in 1204 and brought to Rome, but were returned on 27 November 2004 by Pope John Paul II.
Chrysostom is known within Christianity chiefly as a preacher and liturgist, particularly in the Eastern Orthodox Church. Outside the Christian tradition Chrysostom is noted for eight of his sermons which played a considerable part in the history of Christian antisemitism, and were extensively used by the Nazis in their ideological campaign against the Jews.