Reading from the Synaxarion:

Ambrose, Bishop of Milan

This Saint was born in Gaul in 340, and was a member of the Roman Senate. After the death of Auxentius, the Arian Bishop of Milan, a violent dispute arose among the Orthodox and Arians about who would succeed him. Ambrose, desiring as Governor of the province to restore the peace, attempted to mediate between them. As he spoke to the people, eloquently persuading them to elect a new bishop without tumult and disorder, a young child, inspired from on high, suddenly cried out "Ambrose, bishop!" To his astonishment and dismay, the people immediately took up this cry themselves, and over his many protests, he was raised to the episcopal throne of Milan on December 7, 374. A great Father of the Church, he wrote many works in Latin, and was both an unwearying opponent of Arianism, and a fearless accuser of emperors when they transgressed the law of God. Having lived fifty-seven years, he reposed on April 4, on the eve of Pascha, in the year 397.