Which monastic order, founded in 529 AD, was based at a monastery at Monte Cassino, Italy, until it was sacked in 580, when the monks fled to Rome and then spread throughout Europe?
St. Benedict's monks Black Monk Benedictine order Order of St. Benedictine O.S.B. Benedictine Oblates of St Benedict Black Benedictines Benedictine monasteries Benedictine monastery Benedictine abbey Benedictine monasticism Benedictinian Order Benedictian Oblates of St. Benedict Benedictine religious order Benedictines Black monks Benedictine Order Congregation of St. Justina of Padua Oblates of Saint Frances of Rome O. S. B. Benedictine monks Benedictinian Order of Saint Benedict O.S.B.Cas. Black Monks Benedictine centuries Olivetian Ordo Sancti Benedicti Benedictine monk Order of St Benedict Benedictine nun Oblate of Saint Benedict Benedictine Nuns Collatines Order of St. Benedict Benedictinians Obl.S.B.