What 10th-century monastery became a major reform center emphasizing stricter monastic discipline and independence?

The story behind the answer

Founded in 910 in Burgundy under Duke William of Aquitaine, this abbey was placed directly under papal authority to free it from local lords. It championed rigorous adherence to the Rule of St. Benedict, a disciplined liturgical life, and moral reform, becoming the model for monastic renewal across Western Europe.

Its influence spread through a vast network of dependent priories governed from the mother house—an innovation that centralized standards and amplified its reach. The movement energized Romanesque art and sacred music, bolstered the 11th-century Gregorian Reform, and helped redefine church–state relations. Ironically, its later wealth and splendor sparked new calls for austerity, inspiring the rise of more ascetic communities in the 12th century.