Gianfrancesco Penni
Born in Florence to a family of weavers, Penni entered Raphael's workshop very early in his life, and collaborated with him on several works, including the famous Rooms of the Vatican Palace, as well as the frescoes of Villa Farnesina, both in Rome. Heinrich Wölfflin and some other writers credited him with the entire execution of the Raphael Cartoons, with Raphael only creating the initial design, though more recent writers believe Raphael did much of the work himself.
Raphael
Only some floor-plans remain for a large palace planned for himself on the new via Giulia in the rione of Regola, for which he was accumulating the land in his last years. It was on an irregular island block near the river Tiber. It seems all façades were to have a giant order of pilasters rising at least two storeys to the full height of the piano nobile, "a gandiloquent feature unprecedented in private palace design".