Beside the Obéancier House is the Taurobole fountain which was in fact the old well of the cloister of Saint-Just in the thirteenth century and was transformed into a fountain in the nineteenth century by Flacheron. It was raised in 1828 on the site of the old Chapter well. The marble base depicting the head of a bull adorned for sacrifice has long been considered the reuse of an ancient tauroboly altar from the Cybele cult.