Senator - bishop of Milan - died on 475-05-29.
Benignus - bishop of Milan - died in 472.
Maternus - bishop of Milan - died in 328.
Mirocles - bishop of Milan - died in 316.
Venerius - bishop of Milan - died on 408-05-04.
Glycerius - bishop of Milan - died on 438-09-15.
Senator Bishop voted against marriage equality on September 20, 2012.
Saint Ambose of Milan fits your description.
Ambrose was a convert to Christianity and governor of Milan, Italy, before he was named bishop,
Lanfranc of Milan died in 1306.
Milan Konjović died in 1993.
Milan Crnković died in 1998.
Milan Hlavsa died in 2001.