Detail of the facade of Orvieto Cathedral. The most daring and colorful of all the Italian Gothic. The original project developed by the Sienese Lorenzo Maitani (1255-1330) and Arnolfo di Cambio (1240-1310) was then continued even after the inauguration; in the following centuries by 20 artists over the years took turns leading the project including Antonio Pisano; Andrea Orcagna and Michele Sanmicheli; cathedral opened in 1310