Dante Alighieri (1499-1502), detail. Fresco. Chapel of San Brizio, Duomo, Orvieto. Luca Signorelli (Italian, 1450-1523). The contract to paint the two remaining sections of the ceiling of the Chapel of San Brizio refers to Signorelli as the artist who had painted ‘multas pulcherrimas picturas in diversis civitatibus et presentim Senis’ (many beautiful paintings in different cities and especially in Siena). references from :Source: wikipedia.org or Archive.org http://www.amazon.com,