St. Irenaeus of Lyon

Birth of St. Irenaeus in Smyrna - future Doctor of the Church and defender against Gnosticism

St. Irenaeus becomes Bishop of Lyon - writes 'Against Heresies' combating Gnosticism

Martyrdom of St. Irenaeus at Lyon - Doctor of the Church, established apostolic succession doctrine

Pope Francis declares St. Irenaeus Doctor of the Church with title 'Doctor of Unity'