Santa Maria del Popolo
The architect or architects of this innovative project remain unknown due to a lack of contemporary sources. Giorgio Vasari in his "Lives" attributed all the important papal projects in Rome during Sixtus IV to a Florentine, Baccio Pontelli including the basilica and monastery of Santa Maria del Popolo. Modern researchers deemed this claim highly dubious and proposed other names among them Andrea Bregno, a Lombard sculptor and architect whose workshop certainly received important commissions in the basilica. The fundamental differences between the façade and the interior suggest that maybe more than one architect was working on the building.
Santa Maria del Popolo
With the election of another Della Rovere cardinal, Julius II in 1503, the Basilica of Santa Maria del Popolo again became the favourite church of the reigning pope. Julius was strongly devoted to the icon of Madonna del Popolo but he was also strongly devoted to increasing the glory of his dynasty. For these reasons he took up the work of his uncle and built a spacious new choir between 1505 and 1510 behind the main altar. The project was entrusted to his favourite architect, Donato Bramante. The choir was built in High Renaissance style, and it was decorated with the frescoes of Pinturicchio on the sail vault and the stained glass windows of Guillaume de Marcillat. It was also used as a mausoleum where Andrea Sansovino created two monumental tombs for Cardinal Girolamo Basso della Rovere (†1507), the favourite cousin of the pope, and Cardinal Ascanio Sforza (†1505), his former rival.