St. Denis served as a missionary in Paris, and he later became the first bishop of Paris. The non-Christians were angry over the saint’s success in converting people, so the Roman governor imprisoned him. Along with Ss. Rusticus and Eleutherius, he was martyred during Valerius’ persecutions. The saint died when he was beheaded circa 258 in Montmartre. St. Genevieve built a basilica over his grace. St. Denis is one of the Fourteen Holy Helpers as patron saint against headaches. He is also patron saint against strife and frenzy.