High up to the left of this chapel is the tomb of Cardinal Riccardo Petroni, a famous decretalist but a man of great charity (in spite of Dante the two things are not quite incompatible) in the days of Boniface VIII. It is probably by either Tino di Camaino or Gano, and is a good example of these sepulchral monuments of the early Sienese school, though here, as the monument is to a churchman, the religious ideal prevails over the usually more secular style. In the left transept are statues of the two Piccolomini Popes, Pius II. and Pius III., of whom more presently. As far back as the middle of the sixteenth century, it was supposed that the highly-revered wooden Crucifix, near the statue of Pius III., was the one carried by the Sienese at Montaperti. The chapel of St Ansanus, opposite that of the Blessed Sacrament, has an altar-piece by Francesco Vanni, painted in 1596, representing the Saint baptising the people of Siena, which is a decidedly favourable specimen of the later Sienese school. The bronze relief on the pavement, the tomb of a Bishop Giovanni Pecci, who died in 1426, is a signed work of Donatello. The bas-reliefs let into the wall--representing the Annunciation, the Nativity, the Procession and Adoration of the Magi--date from the first half of the thirteenth century; they are specially interesting here as, when compared with the great pulpit, they illustrate the state of sculpture in Tuscany before the advent of Niccolò Pisano, and enable us to realise what Niccolò effected. The famous pulpit, by Niccolò and his pupils, was [Illustration: INTERIOR OF THE DUOMO]