Note 457 — Chapter IX · POST-CHRISTIAN GNOSTICS: VALENTINUS
Reading edition
We get at a sort of minimum date for its persistence from the career of St Ambrose, who had been a Valentinian in his youth (see Eusebius, Hist. Eccl. Bk VI. c. 18), and was made bishop of Milan in 374 A.D., he being then 34 years old. The sect therefore had adherents in Italy about 360 A.D.