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.
Baronci Altarpiece
The Baronci Altarpiece was a painting by the Italian High Renaissance artist Raphael. His first recorded commission, it was made for Andrea Baronci's chapel in the church of Sant'Agostino in Città di Castello, near Urbino. The altarpiece was seriously damaged during an earthquake in 1789, and since 1849 fragments of the original painting have been part of different collections.