In 1634, the Baroque painter and architect Pietro da Cortona was asked by the Florentine nobleman Orazio Falconieri to design the high altar. Drawings for the altar and its setting and a model were prepared but the project was not carried out. Cortona's ideas for the choir included windows hidden from the view of the congregation that would illuminate the altarpiece, an early example of the Baroque usage of a "hidden light" source, a concept which would be much employed by Bernini. Some twenty to thirty years later, Falconieri resurrected the choir project but gave the commission to the Baroque architect Francesco Borromini, who changed the design to allow for the burial of Orazio's brother, Cardinal Lelio Falconieri. After Borromini's death in 1667, the work was completed and partly modified by Cortona and, on his death in 1669, by Ciro Ferri, Cortona's pupil and associate.