Ambrose

bishop of Milan; one of the four original doctors of the Church (339-397)

Saint Ambrose (c. 330 – 4 April 397) was an Archbishop of Milan. He is an important figure in the Catholic church, and the patron saint of Milan.

Divi Ambrosii Episcopi Mediolanensis Omnia Opera, 1527

Saint Ambrose was one of the four original Doctors of the Church, the title given by the Catholic Church to saints for their significant contribution to theology or doctrine through their research study or writing.

The feast day is celebrated on December 7.