The first chapel on the left is the San Martino Chapel, dedicated to Saint Martin of Tours. It was built by the Franciscan Cardinal Gentile Portino da Montefiore and was decorated between 1317 and 1319 with ten frescoes depicting the saint's life by Simone Martini. This dedication most likely referred to the Cardinal's position as Cardinal-Priest of the Basilica of St. Martin "ai Monti" in Rome, and was intended to be his burial place. It was probably incomplete at the time of Montefiore's death (October 1312), thus he was interred in the neighboring Chapel of St. Louis. Martini also painted a triptych depicting the "Madonna and Child with Two Hungarian Royal Saints" with a row of five attendant saints in the St. Elizabeth Chapel (southern arm of the transept). These are among the greatest Martini's works and the finest examples of 14th-century painting. Over time, however, his use of lead paint has led to the darkening of several sections of these works.