These include, in the lower sector, a bestiary and scenes from the Old Testament; in the middle one it has statues and characters from the New Testament; the frieze and the tympana above the latter have also scenes from the same book, including the "Adoration of the Magi", the "Crucifixion of Jesus" and a "Maestà".
Around 1282 he finished the monument to Cardinal Guillaume de Braye in the church of San Domenico in Orvieto, including an enthroned Madonna (a Maestà) for which he took as a model an ancient Roman statue of the goddess Abundantia; the Madonna's tiara and jewels reproduce antique models.
In particular banderoles were used as attributes for Old Testament prophets, as may be seen in the Santa Trinita Maestà by Cimabue, (Uffizi, 1280-90), Duccio's Maestà (1308-11), and other works.
Other rooms contain a Maestà from the late thirteenth century, altar decorations by Memmo di Filippuccio, a "Madonna and Child" by Vincenzo Tamagni (1528), several Gothic altarpieces (including one showing scenes from the life of Saint Gimignano), a "Madonna with Saints Gregory and Benedict" by Pinturicchio, and two medieval crucifixes of the Florentine school.
The name Definitorio refers to the Capitular Hall (1498), on whose end wall is a fresco of Madonna with Child and Saints by Matteo Ripanda (16th century); the hall houses a small museum of Sacred Arts, with works by Segna di Bonaventura (Madonna with Child), the Master of Monte Oliveto (Maestà), Neroccio di Bartolomeo (St. Bernardino), Vincenzo Tamagni (Madonna with Child) and a fresco portraying St. Sebastian by an artist of the Sienese School.