Church Father, Archbishop of Constantinople and Christian saint (c. 347–407 AD)
Source (Wikipedia): John Chrysostom

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.