 During the Merovingian and early Carolingian eras, the main focus of devotion for pilgrims was a well (now located in the north side of Fulbert's crypt), known as the "Puits des Saints-Forts", or the 'Well of the Strong Saints', into which it was believed the bodies of various local Early-Christian martyrs (including saints Piat, Cheron, Modesta and Potentianus) had been tossed.Chartres became a site for the veneration of the Blessed Virgin Mary.In 876 the cathedral acquired the "Sancta Camisa", believed to be the tunic worn by Mary at the time of Christ's birth.