Who is Saint Ambrogio?

I was just asking this question myself and found this: http://www.saintambrogio.com/aboutus.html#Church SAINT AMBROGIO, the patron Saint of Ferentino, was a Roman soldier who was persecuted for his Christian beliefs. He refused to give up his faith and was finally slain on August 15, 304 A.D. over 1700 years ago. Nine years later when Emperor Constantine legalized Christianity by the Edict of Milan, Christians could finally openly honor their beloved Saint. A historical perspective of the Patron Saint of Ferentino can be found in the abridged translation of "la Festa in Onore di S. Ambrogio A Ferentino" by Biancamaria Valeri translated by Thomas D. Luchetti of Rockford, IL.