The Cathedral of Saint-Denis is a historic church located in Saint-Denis, a suburb of Paris, France. It is considered the first major example of Gothic architecture, featuring innovative elements like ribbed vaults and flying buttresses. The cathedral was originally built in the 5th century and later rebuilt in the 12th century. This cathedral is also known as the burial site for many French kings and queens, making it a significant royal necropolis. Notable figures interred here include King Louis XVI and Marie Antoinette. The Cathedral of Saint-Denis played a crucial role in the development of French architecture and history.