The choice of Montmartre hill by the Archbishop of Paris to build the church of the Sacred Heart was not insignificant. Ever since the 3rd century, the hill has been known as the Mount of Martyrs because it was there that Denis, the first Bishop of Paris, and his companions Eleuthero and Rusticus, were put to death by the Romans. In 475, a chapel was built on the tomb of the martyrs, located a few kilometres north of Montmartre, in Saint-Denis. A convent of Benedictine nuns, the Royal Abbey of Montmartre, was founded on the Butte in the 12th century and prospered until the Revolution. The rue des Abbesses, at the foot of the hill, evokes its memory.