County of Hainaut
The abbey was repaired and restored in 1025 by Gerard of Florennes (Gérard de Cambrai) after the Norman invasions. It suffered damage in the 14th and 15th centuries in wars involving the County of Hainaut. Reconstruction projects took place during the 16th and 18th centuries. The abbey reached its peak in terms of power and wealth during the 18th century.