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.
Theodoli Chapel (Santa Maria del Popolo)
The completion of the Theodoli Chapel could be placed around 1575 because Mazzoni returned to Piacenza in the next year. The chapel was refurbished by Marquis Girolamo Theodoli about 150 years later. The large stucco cartouche above the entrance arch with the coat of arms of the Theodoli family probably belongs to this phase. The paintings were restored and refreshed by Giacomo Triga, the court painter of marquis. The 18th century redecoration is probably related to the Jubilee Year of 1725 but the intervention did not significantly alter the 16th century aspect of the chapel.