Ambrose, Bishop of Milan

Reading from the Synaxarion:

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.

Apolytikion in the Fourth Tone
The truth of things hath revealed thee to thy flock as a rule of
faith, an icon of meekness, and a teacher of temperance; for this cause,
thou hast achieved the heights by humility, riches by poverty. O
Father and Hierarch Ambrose, intercede with Christ God that our souls be
saved.

Kontakion in the Third Tone
Flashing lightning-like with godly doctrines, thou, O Ambrose, dravest off
the darkness of the impious error of Arius; and working wonders and
signs by the Spirit's might, thou, O good shepherd, didst heal divers
sufferings. Righteous Father, thou initiate of sacred mysteries, entreat
Christ God to grant great mercy unto us.