Simplician was born about 320 probably in Rome and still young he became a churchman. He became expert in the Holy Scripture and very educated. In about 355 he took an active part in the conversion to Christianity of the philosopher Marius Victorinus. When in 374 Ambrose was elected bishop of Milan and baptized, Simplician became his teacher of doctrine. Ambrose used to call Simplician father, as a sign of spiritual relationship. Probably in this period Simplician moved to Milan where he remained.
