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.
Sgraffito
Sgraffito played a significant role during the years of the Renaissance in Italy, with two of Raphael's workshop, Polidoro da Caravaggio and his partner Maturino da Firenze, among the leading specialists, painting palace facades in Rome and other cities. Most of their work has now weathered away. During the 16th century, the technique was brought to Germany by the master builders of the Renaissance and taken up with enthusiasm. As a simple native art, old examples of sgraffito can be found in the wide surroundings of Wetterau and Marburg. In Germany, the technique is most predominant in Bavaria. The use of sgraffito was common in the creation of housing façades for the purposes of advertising. The technique was also used in Thuringia, the Engadin, Austria and Transylvania.