The right side of the nave above the side entrance. Modeled on the tomb of Pius II opposite, the monument was built in 1503 by Sebastiano Ferrucci. In the first box, Pius III, kneeling at the side of the Holy Virgin, but receives the one hand the keys over the S. Peter, on the other hand, S. Paul, the soul and holds it up. In the second box, the pope carved lying on the urn in which it is written: Pius III. In the third, in excellent relief, represented his coronation. The side niches reliefs with pilasters bearing pillars and capitals and contain six statues of Saints Romuald, (first on the left below), Francis of Assisi, Pope Pius I, Gregory the Great, Andrew and James. The first inscription bears the dedication of the monument, made for him by his brothers Andrew and James; the second recalls the placement of the monument in S. Andrea della Valle in 1614. The pope is actually buried under the floor of the santuary.