 In 1513, Cardinal Giovanni di Lorenzo de' Medici, shortly before he became Pope Leo X, in conjunction with Andrea Sansovino added the facade portico with Tuscan columns and the fountain.He was followed by Giulio di Giuliano de 'Medici, the future Pope Clement VII from 1513-7.Giovanni de' Medici became cardinal-deacon at the age of 17 in 1560, but died in 1562.