In contrast to Broek op Langedijk, it was not the farmers and residents but rather the monks who were the driving force behind the reclamation of the land around Saint Omer. Saint Omer originated in the 7th century around the founded Abbey of Saint Bertin. The Abbey of Saint Bertin became one of the most influential monasteries in Northwest Europe. The abbey experienced its greatest prosperity from its founding until the mid-13th century. From the 9th century, it was responsible for draining thousands of hectares of marshland. The abbey remained until its dissolution in August 1791 following the French Revolution. The forty remaining monks were expelled, and the buildings were initially used as a hospital for the French army. Soon after, the dismantling of the buildings began. What the monks had not taken with them was publicly auctioned (including woodwork, paintings, altars, stained glass, marble, furniture, reliquaries, consecrated vessels, tapestries, organs, ironwork, and the bells of the carillon). The buildings were sold but remained partially intact. In 1811, the municipal government repurchased the buildings. The nave of the church was still standing, but it was further demolished, and the materials were used to build Saint Omer’s town hall, a music school, and a slaughterhouse. From 1840, the remaining walls and ruins were preserved as a protected monument. The abbey tower (58 m) remained standing but collapsed in 1947. The remnants of the abbey are now a striking presence on the outskirts of the city.