Ambrose of Milan was a prominent 4th-century bishop known for his influential role in the early Christian Church. Born around 340 AD, he became the Bishop of Milan in 374 AD and was instrumental in the spread of Christianity in the Western Roman Empire. His eloquent preaching and theological writings helped shape Christian doctrine during a time of significant religious conflict. Ambrose is also recognized for his strong stance against Arianism, a belief that challenged the divinity of Christ. He played a key role in the conversion of Augustine of Hippo, one of Christianity's most important theologians. Ambrose's legacy includes his contributions to liturgy and the development of church music.