A Source Book of Mediæval HistoryNote 365 — Chapter XV · THE MONASTIC REFORMATION OF THE TENTH, ELEVENTH, AND TWELFTH CENTURIESReading editionBerno served as abbot of Cluny from 910 until 927.◇Copy noteReturn to CHAPTER XV. THE MONASTIC REFORMATION OF THE TENTH, ELEVENTH, AND TWELFTH CENTURIES