Agilus was a 7th-century Frankish nobleman who dedicated his life to Christian monasticism. After being educated at Luxeuil Abbey under Saint Columbanus, he participated in missionary work in Bavaria alongside Eustace of Luxeuil, where he is credited with helping to found Weltenburg Abbey. Later in his life, he served as the first abbot of the Rebais monastery near Paris, a position he held following a council in Clichy in 636. He died in 650 and is remembered as a saint in the Catholic and Orthodox traditions.