The great church of San Francesco was mainly built in the second quarter of the fourteenth century, from the designs of Agostino di Giovanni and Agnolo di Ventura. It was outside the walls and there was a gate of San Francesco, under the arch of which we still pass to-day. When Pius II. came to Siena, he stayed in the convent and the gate had to be kept open at night for the convenience of his numerous visitors[153]--which induced the Concistoro to decree that it should henceforth be included within the walls. Over the door of the church is a statue of St Francis, by Ramo di Paganello of about 1288. Ruined by fire in the seventeenth century, abandoned to military purposes in the nineteenth and recently restored, the building is but the shadow of its former self. Still, in spite of the modern stained-glass windows from Munich, it remains the most simple and severe, the most typical and austerely Franciscan of all the Italian Gothic churches of Tuscany. The paintings and sculptures that it contains are mere fragments of its original decorations, and for the most part transferred from other parts of the church and convent. The ruined fresco of the Visitation, on the right of the entrance, is ascribed by Mr Berenson to Taddeo di Bartolo. In the second chapel on the right of the choir is the monument of Cristoforo Felici (one of the Operai of the Duomo) of 1462, one of the best works of Urbano da Cortona. In the choir are marble half-length portraits of Silvio Piccolomini and Vittoria Forteguerri, the only remains of the sumptuous monument that their son, Pope Pius II., raised to their memory in 1458. In the first chapel on the left is a frescoed Crucifixion by Pietro Lorenzetti, and in the third chapel are two scenes from the history of the Franciscan order--St Francis before the Pope and the Martyrdom of Franciscan Missionaries--by Ambrogio Lorenzetti. Ruined and repainted, these latter appear to be the remains of a series of frescoes which Ghiberti saw and admired in the cloisters here. The chapel opposite was formerly that of the nephews of Pius II., the Todeschini Piccolomini and Piccolomini d'Aragona; it was restored and modernised by a noble lady of the Saracini a few years ago. The Cardinal Virtues on the pavement were originally executed by Lorenzo di Mariano. In the cloisters, outside the Seminary chapel, there is a Madonna Lattante, entitled _Sedes Sapientiae_, by Giacomo Cozzarelli. The chapel itself contains a most beautiful Madonna and Child by Ambrogio Lorenzetti, and a large fresco, of uncertain authorship, of the same epoch. The Seminary further possesses several good early Sienese paintings.