John Chrysostom was an important Early Church Father who served as Archbishop of Constantinople. He is known for his preaching and public speaking, his denunciation of abuse of authority by both ecclesiastical and political leaders, his Divine Liturgy of Saint John Chrysostom, and his ascetic sensibilities. The epithet Χρυσόστομος means "golden-mouthed" in Greek and denotes his celebrated eloquence. Chrysostom was among the most prolific authors in the early Christian Church.
He is honored as a saint in the Eastern Orthodox, Oriental Orthodox, Catholic, Anglican, and Lutheran churches, as well as in some others. The Eastern Orthodox, together with the Byzantine Catholics, hold him in special regard as one of the Three Holy Hierarchs. Along with them and Athanasius of Alexandria he is also regarded as one of the four Great Greek Church Fathers The feast days of John Chrysostom in the Eastern Orthodox Church are 14 September, 13 November and 27 January. In the Catholic Church, he is recognized as a Doctor of the Church.