 It is unknown if the original work possessed a marble staircase.The church also houses the relics of Saint Rainerius, patron saint of Pisa, and the fragmentary tomb of Henry VII, Holy Roman Emperor, who died at Buonconvento while holding Florence, in vain, under siege.The tomb, sculpted by Tino da Camaino between 1313-1315, was also dismantled then reconstructed and today sits in the right transept, while its original position was in the center of the apse as a sign of the city's ghibbeline adherence.