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.
Saint Ambrose, also known as Ambrogio, was a bishop of Milan in the 4th century. He was known for his theological writings, particularly on the importance of scripture and the role of the Church. He is considered one of the four original doctors of the Church in Western Christianity.
He comes from Milan, and he is a saint because he is consecrated by the sacred church. See the related link for more information.
Ambrogio Contarini was born in 1429.
Ambrogio Contarini died in 1499.
Ambrogio Casati died in 1977.
Ambrogio Casati was born in 1897.
Ambrogio Lorenzetti was born in 1285.
Ambrogio Calepino died in 1510.
Ambrogio Besozzi died in 1706.
Ambrogio Besozzi was born in 1648.
Ambrogio Levati died in 1963.
Ambrogio Levati was born in 1894.
Ambrogio Fogar was born in 1941.