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
One of his most important papal commissions was the Raphael Cartoons (now in the Victoria and Albert Museum), a series of 10 cartoons, of which seven survive, for tapestries with scenes of the lives of Saint Paul and Saint Peter, for the Sistine Chapel. The cartoons were sent to Brussels to be woven in the workshop of Pier van Aelst. It is possible that Raphael saw the finished series before his death—they were probably completed in 1520. He also designed and painted the "Loggie" at the Vatican, a long thin gallery then open to a courtyard on one side, decorated with Roman-style grottesche. He produced a number of significant altarpieces, including "The Ecstasy of St. Cecilia" and the "Sistine Madonna". His last work, on which he was working up to his death, was a large "Transfiguration", which together with "Il Spasimo" shows the direction his art was taking in his final years—more proto-Baroque than Mannerist.