Saint Ambrose was a prominent Christian bishop of Milan in the 4th century. He is known for his influential role in the early Church and his efforts to promote Christian doctrine. Ambrose was also a skilled orator and writer, contributing significantly to Christian theology and liturgy. He is often credited with introducing hymns into Christian worship. Ambrose played a key role in the conversion of Saint Augustine, who later became one of the most important theologians in Christianity. He is recognized as a Doctor of the Church and is celebrated for his defense of the faith against heresies. His feast day is observed on December 7.