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.
Ferdinando Sanfelice
Sanfelice was known primarily for temporary displays and his secular architecture. The former involved displays such as those set up for royal visits and births as well as for religious celebrations; the latter included a large number of family dwellings in Naples, including his own Palazzo Sanfelice, built between 1723 and 1728, and the Palazzo Serra di Cassano, finished around 1730. Most notable in Sanfelice's architecture are the staircases; rather than being incidental features set off to the side of a courtyard, he gave them central and prominent positions so that they became important architectural features in their own right, often as double staircases.