He played a crucial role in the development of Cluny as a leading center of monastic life in Western Europe during the Middle Ages.

Odilo was born into a noble family in Auvergne, France. His father was Berald de Mercœur, and his mother, Gerberga, became a nun after her husband’s death. Odilo entered the seminary at St. Julien in Brioude and later joined the monastery at Cluny around 991 under Abbot Mayeul.

Odilo became abbot of Cluny shortly before Mayeul’s death in 994 and led the monastery for approximately fifty-five years. Under his leadership, Cluny flourished and became renowned for its strict adherence to the Rule of St. Benedict. During his tenure, the number of affiliated monasteries increased from thirty-seven to sixty-five.


Establishment of All Souls’ Day

One of Odilo’s most notable contributions was the establishment of All Souls’ Day on November 2nd, as a day dedicated to praying for all departed souls.

Odilo died on January 1, 1049, while visiting Souvigny Priory. His legacy is marked by his deep commitment to prayer, charity towards the poor (notably selling church treasures during famines), and fostering peace in society through both spiritual guidance and practical reforms. He was canonized shortly after his death due to widespread veneration and recognition of his holiness.