Gothic architecture
Sens Cathedral (begun between 1135 and 1140) was the first Cathedral to be built in the new style (St. Denis was an abbey, not a Cathedral). Other versions of the new style soon appeared in Noyon Cathedral (begun 1150); Laon Cathedral (begun 1165); and the most famous of all, Notre-Dame de Paris, where construction had begun in 1160.
Basilica of Saint-Denis
The Basilica of St Denis ranks as an architectural landmark—as the first major structure of which a substantial part was designed and built in the Gothic style. Both stylistically and structurally, it heralded the change from Romanesque architecture to Gothic architecture. Before the term "Gothic" came into common use, it was known as the "French Style" ("Opus Francigenum").