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 Rooms
Raphael completed the second composition between 1509 and 1511. It represents "The Parnassus", the dwelling place of the god Apollo and the Muses and the home of poetry, according to classical myth. In the fresco Apollo and the muses are surrounded by poets from antiquity and Raphael's own time.