Original: The reforms were largely carried out by Saint Odo ( c. 878 -- 942 ) and spread throughout France ( Burgundy , Provence , Auvergne , Poitou ) , into England , and through much of Italy and Spain.Justus.Anglican.org
Simplified: Among the most notable reform supporters were Pope Urban II , Lambert of Hersfeld and Abbot Richard of Saint Vannes at Verdun .