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.
Cybo-Soderini Chapel (Santa Maria del Popolo)
There is not much left of the original Renaissance interior of the chapel except the large crucifix on the altar and the slabs of the beautiful marble transenna. It is uncertain whether it had any painted decoration. The chapel was fully restored after 1636 in Baroque style by a certain Innocenzo Cybo (†1640). At the time the walls and the vault were decorated with the extant frescos of Pieter van Lint, Ionic stucco capitals were added to the half-columns of the entrance arch and the burial vault was sealed with a new tomb slab.