Raphael
This first of the famous "Stanze" or "Raphael Rooms" to be painted, now known as the "Stanza della Segnatura" after its use in Vasari's time, was to make a stunning impact on Roman art, and remains generally regarded as his greatest masterpiece, containing "The School of Athens", "The Parnassus" and the "Disputa". Raphael was then given further rooms to paint, displacing other artists including Perugino and Signorelli. He completed a sequence of three rooms, each with paintings on each wall and often the ceilings too, increasingly leaving the work of painting from his detailed drawings to the large and skilled workshop team he had acquired, who added a fourth room, probably only including some elements designed by Raphael, after his early death in 1520. The death of Julius in 1513 did not interrupt the work at all, as he was succeeded by Raphael's last Pope, the Medici Pope Leo X, with whom Raphael formed an even closer relationship, and who continued to commission him. Raphael's friend Cardinal Bibbiena was also one of Leo's old tutors, and a close friend and advisor.
Timoteo Viti
In 1503 Viti was painting banners for Cesare Borgia, who had expelled Duke Guidobaldo da Montefeltro as lord of the city. Guidobaldo regained Urbino in 1504 and Viti, along with Girolamo Genga, was commissioned by Bishop Arrivabene to decorate the chapel of S Martino in the cathedral. He continued to work successfully in the Marches for the rest of the decade, and as far south as Siena, where he and Genga collaborated on paintings in the Palazzo Petrucci in about 1508. 
Around 1514, Viti formed part of the large team assembled by Raphael and worked on the frescoes Raphael designed in the Chigi Chapel in Santa Maria della Pace in Rome. It has been suggested that he is depicted (as the Ancient Greek painter Protogenes) in "The School of Athens", Raphael's most famous work, standing next to Raphael's self-portrait, although Vasari does not mention this identification.