The Cathedral of Notre Dame du Bourg in Digne is built over a Christian church from Roman times.
Saint Vincent was from North Africa, a Christian citizen of the Empire, free to travel anywhere, who was sent to the walled town of Digne in the mountains north of Nice.
Pope Saint Miltiades gathered a council in 313. The persecutions which saw the death of another Saint Vincent, the Deacon of Valencia, were over, after Constantine had allowed freedom of worship to Christians. The problem now lay within the church, especially in North Africa: what to do about people who had handed over books and church property to the Imperial authorities. The Donatist party felt strongly that they had lost their right to belong to the church, but the Pope and Council decreed that there should be every opportunity for reconciliation.
Vincent travelled with Marcellinus and Domninus to the council with the African bishops, and impressed Pope Militades, who sent them as missionaries to Provence. Marcellinus became the first bishop of Embrun, Domninus bishop of Digne. Vincent would be his successor.