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
The most famous original prints to result from the collaboration were "Lucretia", the "Judgement of Paris" and "The Massacre of the Innocents" (of which two virtually identical versions were engraved). Among prints of the paintings "The Parnassus" (with considerable differences) and "Galatea" were also especially well known. Outside Italy, reproductive prints by Raimondi and others were the main way that Raphael's art was experienced until the twentieth century. Baviero Carocci, called "Il Baviera" by Vasari, an assistant who Raphael evidently trusted with his money, ended up in control of most of the copper plates after Raphael's death, and had a successful career in the new occupation of a publisher of prints.