St. Denys, also known as Saint Denis, is a significant figure in early Christian history, recognized as the first Bishop of Paris. He is often depicted holding his own head, a reference to his martyrdom around the 3rd century. His feast day is celebrated on October 9th, and he is the patron saint of France. The Basilica of Saint-Denis, located just north of Paris, is a major site dedicated to him. This church is notable for its stunning Gothic architecture and serves as the burial place for many French kings and queens, highlighting St. Denys's importance in both religious and national history.