Why is the Abbey of Saint-Denis often called the first Gothic building?

The Abbey of Saint-Denis is widely considered the first Gothic building because it was one of the earliest structures to integrate key architectural elements—specifically the ribbed vault, the pointed arch, and the flying buttress—into a single, sophisticated and coherent design.12

Rebuilt between approximately 1135 and 1144 under the direction of Abbot Suger, the abbey utilized these engineering innovations to create a structure that allowed for greater height and the inclusion of larger windows. Suger, who was deeply influenced by a theological belief in the spiritual quality of light, sought to transform the interior space through the use of extensive stained glass.123

While these individual technical features existed in earlier Romanesque buildings, the precision and skill with which they were combined at Saint-Denis—particularly in the design of the ambulatory and chapels—established a new architectural standard that defined the beginning of the Gothic style.12