Catholic Encyclopedia - This Vitalis was a slave, converted to Christianity by his master Agricola. Both were martyred at Bologna about 304. www.newadvent.org/cathen/15486b.htm
Catholic Online - Seems to think that Vitalis was Agricola, or that the slave converted the master. saints.catholic.org/saints/vitalis2.html
For All the Saints - A summary of what St. Ambrose says. users.erols.com/saintpat/ss/1104.htm#vita
