The mosaics of St. Peter's often show lively Baroque compositions based on designs or canvases from like Ciro Ferri, Guido Reni, Domenichino, Carlo Maratta, and many others. Raphael is represented by a mosaic replica of this last painting, the Transfiguration. Many different artists contributed to the 17th- and 18th-century mosaics in St. Peter's, including Giovanni Battista Calandra, Fabio Cristofari (died 1689), and Pietro Paolo Cristofari (died 1743). Works of the Fabbrica were often used as papal gifts.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What year did Pietro Paolo Cristofari die?
1743