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
Julius II granted assent to the wealthy Sienese banker, Agostino Chigi, who was adopted into the Della Rovere family, to build a mausoleum replacing the second side chapel on the left in 1507. The chapel was dedicated to the Virgin of Loreto whose cult was ardently promoted by the Della Rovere popes. The Chigi Chapel was designed by Raphael and it was partially completed in 1516 but remained unfinished for a very long time. This ambitious project created a strong connection between the basilica and the Chigis that extended well into the next century.