The Basilica of San Francesco in Arezzo houses one of the greatest masterpieces of the Italian Renaissance: the Legend of the True Cross, a cycle of frescoes by Piero della Francesca painted in the 15th century. These luminous, mathematically composed works in the main chapel are of world importance. A humble Gothic church from the outside, the basilica holds art of extraordinary significance, making it one of the essential sights of Arezzo and a pilgrimage for lovers of Renaissance painting.