Saint Ado was born in Sens and educated at the Benedictine abbey of Ferrieres. Saint Ado renounced his inheritance and became a Benedictine. He was assigned to the monastery of Prum, near Trier, Germany where his enemies forced to leave. He went to Rome on a pilgrimage and for two years and then went to Ravenna. He served as a pastor in Lyons until 860, when he became the archbishop of Vienne, appointed by Pope Nicholas I. Saint Ado wrote the lives of Saint Desiderius and Saint Theuderis. Lothair II, the king of Lorraine, tried to set aside his lawful wife to marry his mistress. Lothair bribed officials to get a divorce from his queen but was undone when Ado went to Rome and denounced the plot to the pope. Died: 875, Feastday: December 16.