By the end of the Western Roman Empire, the town was known simply as Parisius in Latin and Paris in French. Christianity was introduced in the middle of the 3rd century AD. According to tradition, it was brought by Saint Denis, the first Bishop of Paris. When he refused to renounce his faith, he was beheaded on the hill which became known as the "Mountain of Martyrs" (Mons Martyrum), eventually "Montmartre". His burial place became an important religious shrine; the Basilica of Saint-Denis was built there and became the burial place of the French Kings.