Saint Mansuetus (French: Mansuy) (died 375) was the first Bishop of Toul. He is thought to be of Irish or Scottish origin. After religious studies in Rome, he was sent by Pope Damasus I to evangelize Gaul, becoming the first bishop of Toul in 365.
According to the Vita Sancti Gerardi, Bishop St. Gerard I of Toul (r. 963–994) had the relics of both Mansuetus and Aprus brought into Toul and placed in the church of St. John the Baptist while he was ill.[1]
His feast day is celebrated on September 3.