He was followed in 1359 by Andrea di Cione, better known as Orcagna. The beautiful mosaic decoration and the rose window are attributed to him. The Sienese architect Antonio Federighi continued the decoration of the façade between 1451 and 1456, adding some Renaissance modules. In 1503 Michele Sanmicheli finished the central gable and added the right spire, which was finished by Antonio da Sangallo, Junior in 1534. Final touches to the façade were made by Ippolito Scalza by adding the right pinnacle in 1590 and the left in 1605–1607. All in all, the succeeding architects kept a stylistic unity to the façade. The Gothic façade of the Orvieto Cathedral is one of the great masterpieces of the Late Middle Ages. The three-gable design is attributed to Maitani, who had clearly undergone some influence by the design scheme for the façade in Tuscan Gothic style of the Siena Cathedral by Giovanni Pisano (1287–1297) and the plan for façade of the Florence Cathedral by Arnolfo di Cambio (1294–1302). The most exciting and eye-catching part is its golden frontage, which is decorated by large bas-reliefs and statues with the symbols (Angel, Ox, Lion, Eagle) of the Evangelists created by Maitani and collaborators (between 1325 and 1330) standing on the cornice above the sculptured panels on the piers. In 1352 Matteo di Ugolino da Bologna added the bronze Lamb of God above the central gable and the bronze statue of Saint Michael on top of the gable of the left entrance. The bas-reliefs on the piers depict biblical stories from the Old and New Testament. They are considered among the most famous of all 14th-century sculpture. These marbles from the fourteenth and fifteenth century are the collective and anonymous work of at least three or four masters with assistance of their workshops, It is assumed that Maitani must have worked on the reliefs on the first pier from the left, as work on the reliefs began before 1310. The installation of these marbles on the piers began in 1331. They depict from left to right:  Above this decoration are glittering mosaics created between 1350 and 1390 after designs by artist Cesare Nebbia. These original pieces have been replaced and redesigned in the centuries since, particularly in 1484, 1713 and 1842.