Notre-Dame de Saint-Omer was a cathedral, in Saint-Omer, France. Today, it is an ordinary church. This is because after the French revolution, the seat of the bishop was moved to Arras. It is still a historical monument. There was a small chapel where the Cathedral stands today. The chapel was built in the 8th century. Around 1052, a church was built on the site. Around 1200, a fire greatly damaged the church. Reconstruction in Gothic style started around 1263. Since it was a major work, it took a long time. The main construction works were done form the 13th to the 16th century. By that time, there was a college associated with the church. 1714 saw the installation of the bishop's seat; in 1717 the last touch-ups were done to the pipe organ. The woodwork and the bishop's seat date from 1753.