Denis of France, also known as Saint Denis, is a significant figure in Christian history and the patron saint of France. He is believed to have been a 3rd-century missionary who became the first bishop of Paris. Denis is often depicted holding his own head, a reference to his martyrdom, as he was executed for his faith. His feast day is celebrated on October 9, and he is associated with the Sainte-Chapelle and the Basilica of Saint-Denis, where many French kings are buried. Denis symbolizes the strength of faith and the early spread of Christianity in France.