Cluny Abbey
William I, Duke of Aquitaine (875-918) had acquired a piece of land in Burgundy. In 910 he founded Cluny Abbey and asked Abbot Berno of Baume Abbey to preside. The Abbot of Cluny retained authority over the daughter houses his order founded. By the twelfth century, the Congregation of Cluny included more than a thousand monasteries.