Entering the lower basilica, one sees at the other side of the vestibule the chapel of Saint Catherine of Alexandria, erected about 1270. It was enlarged by Gattapone da Gubbio and decorated at the expense of Cardinal Egidio Albornoz, papal legate in charge of the Papal States (from 1350 to 1367). He was initially buried here but his body was later transferred to Toledo, Spain. The frescoes with the eight episodes from the life of Saint Catherine were painted in 1368–1369 by ‘Andreas pictor de Bononia’. This painter, called Andrea, is most probably Andrea de’ Bartoli (c. 1349 – 1369), the court artist of Albornoz (and not Andrea da Bologna, as usually, but wrongly, attributed). The saints in this chapel were painted by Pace di Bartolo d'Assisi (1344–1368). The stained glass windows are the work of Giovanni di Bonino of Assisi (mid-14th century).