 The "Chiostro Grande" ("Great Cloister") has a rectangular plan and was realized between 1426 and 1443.On the oldest side it has a two-storey loggia and a pit, dating to 1439.The frescoes of the "Life of St. Benedict" painted by Luca Signorelli and il Sodoma, located in the cloister lunettes under the vaults, are considered masterworks of the Italian Renaissance.