c.339 - 397
Bishop of Milan

Ambrose was born in Gaul. He became one of the most influential figures of his time. As bishop of Milan he evoked sanctions against Emperor Theodosius I for his massacre of a civilian populace.

He modelled Christian duties after Cicero and fought to make the church independent of civil power. He was a leader, preacher, and author. Saint Ambrose was called a Doctor of the Western Church.

www link :
From the Catholic Encyclopedia:

Saint Ambrose :
Defending the autonomy of
the Church