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.
Basso Della Rovere Chapel (Santa Maria del Popolo)
The chapel was furnished by Bishop Girolamo Basso della Rovere after his uncle, Pope Sixtus IV had reconstructed the basilica from 1472 to 1477. The painted decoration is attributed to Pinturicchio and his workshop, who worked here in an unspecified period between 1484, when the chapel was fitted, and 1492, when his patron received the bishopric of Palestrina instead of that of Recanati, which is mentioned in the dedicatory inscription on the monument of his father, Giovanni Basso.