The Feast of St. Ambrose of Milan, Bishop and Doctor of the Church
is today. There is information on him here.

Did St. Athanasius or St. Ambrose come suddenly to life, it cannot be doubted what communion he would take to be his own. All surely will agree that these Fathers, with whatever opinions of their own, whatever protests, if we will, would find themselves more at home with such men as St. Bernard or St. Ignatius Loyola, or with the lonely priest in his lodging, or the holy sisterhood of mercy, or the unlettered crowd before the altar, than with the teachers or with the members of any other creed. And may we not add, that were those same Saints, who once sojourned, one in exile, one on embassy, at Treves, to come more northward still, and to travel until they reached another fair city, seated among groves, green meadows, and calm streams, the holy brothers would turn from many a high aisle and solemn cloister which they found there, and ask the way to some small chapel where mass was said in the populous alley or forlorn suburb?

Venerable John Henry Newman, C.O., An Essay on the Development of Christian Doctrine

It is also the feast of St. Mary Joseph Rosello, Virgin and Foundress. To any members of the Institute of the Daughters of Mercy out there, blessed feast day !