Laon, located in the Hauts-de-France in northern France, was the medieval capital of the Carolingian kings of France, beginning with Louis IV. Hugh Capet, who became king in 987, seized the town with the connivance of the local bishop and moved the capital to Paris. Laon was developed into a walled city in the second part of the 12th century and the cathedral was built in the 12th and 13th centuries. The cathedral’s stained glass dates mostly from the 13th century. The cathedral of Laon is one of the most important and stylistically unified examples of early Gothic architecture.