Saint Berno of Cluny (French: Bernon) or Berno of Baume (c. 850 – 13 January 927) was first abbot of Cluny from its foundation in 910 until he resigned in 925. He began the tradition of the Cluniac reforms which his successors spread across Europe.
Berno was first a monk at St. Martin's Abbey, Autun, and then at Baume Abbey about 886. In 890, he founded the monastery of Gigny on his own estates, and others at Bourg-Dieu and Massay. In 910, William I of Aquitaine, founder of Cluny, nominated him abbot of the new foundation. Berno placed the monastery under the Benedictine rule (founded by Benedict of Nursia and reformed by Benedict of Aniane).
He resigned as abbot in 925, his abbeys being divided between his relative Vido and his disciple Odo of Cluny.
He is regarded as a saint, with his feast day on 13 January.
St Benedict of Nursia had founded his famous monastery at Monte Cassino in the 5th century, and from it, his ideas and his Rule would come to influence western European monasticism. However, over time the rules mellowed. Many monasteries were established by teutonic feudal lords intending to retire there at the end of their lives, who altered the rules according to their tastes. Benedict had forbidden the eating of meat, but they would allow it. Matins were scheduled so as not interrupt sleep. They wore richer, warmer clothing. There were no fixed rules on fasting, and it was left to the individual. Monks were allowed to visit families and friends.
Many monasteries became like fiefdoms, passed on through the family. Viewed as simply part of the founder's possessions, they could be divided up in inheritance as well. Benedict's rule had provided that the Abbot should be chosen by the monks, but the feudal lord assumed that right. Monks regarded the abbot like a feudal chieftain, and upon his death felt free to leave.
Charlemagne became interested in monasticism because of the opportunities for learning and the preservation of books. He supported the institution, but from the perspective of culture and education. Louis the Pious, Charlemagne's son, commissioned St Benedict of Aniane to reform monasticism within the Carolingian empire, to bring it back to what Benedict of Nursia had originally intended. It was decided that the Rule of St Benedict would be enforced in all monasteries, and Benedict of Aniane was given the task of interpreting it and outlining how it should be practiced.