Bishop Ambrose, also known as Saint Ambrose, was a prominent Christian bishop in the 4th century, serving as the Bishop of Milan from 374 until his death in 397. He is recognized for his influential role in the early Christian Church and is one of the four original doctors of the Church. Ambrose was known for his eloquent preaching and his efforts to promote Christian doctrine. He played a significant role in the conflict between the Church and the Roman Empire, notably opposing the Arian heresy. Ambrose is also credited with developing the practice of hymn singing in Christian worship, contributing to the rich tradition of Christian music. His feast day is celebrated on December 7.