Working in this manner in the service of his master Raffaello, and learning the most difficult secrets of art, which were taught to him by Raffaello himself with extraordinary lovingness, before a long time had passed Giulio knew very well how to draw in perspective, take the measurements of buildings, and execute ground-plans; and Raffaello, designing and sketching at times inventions after his own fancy, would afterwards have them drawn on a larger scale, with the proper measurements, by Giulio, in order to make use of them in his works of architecture. And Giulio, beginning to delight in that art, gave his attention to it in such a manner, that he afterwards practised it and became a most excellent master. At his death, Raffaello left as his heirs Giulio and Giovan Francesco, called Il Fattore, on the condition that they should finish the works begun by him; and they carried the greater part of these to completion with honour. [Illustration: THE BATTLE OF CONSTANTINE (_Detail, after the fresco by =Giulio Romano=. Rome: The Vatican_) _Anderson_] Now Cardinal Giulio de' Medici, who afterwards became Pope Clement VII, took a site under Monte Mario at Rome, in which, besides a beautiful view, there were running waters, with some woods on the banks and a lovely plain which, running along the Tiber as far as the Ponte Molle, formed on either side a wide expanse of meadowland that extended almost to the Porta di S. Pietro; and on the highest point of the bank, where there was a level space, he proposed to build a palace with all the best and most beautiful conveniences and adornments that could be desired in the form of apartments, loggie, gardens, fountains, groves, and other things. Of all this he gave the charge to Giulio, who, undertaking it willingly, and setting his hand to the work, brought that palace, which was then called the Vigna de' Medici, and is now known as the Villa Madama, to that condition which will be described below. Accommodating himself, then, to the nature of the site and the wishes of the Cardinal, he made the facade in the form of a semicircle, after the manner of a theatre, with a design of niches and windows of the Ionic Order; which was so excellent, that many believe that Raffaello made the first sketch for it, and that the work was afterwards pursued and carried to completion by Giulio. The same Giulio painted many pictures in the chambers and elsewhere; in particular, in a very beautiful loggia beyond the first entrance vestibule, which is adorned all around with niches large and small, wherein are great numbers of ancient statues; and among these was a Jupiter, a rare work, which was afterwards sent by the Farnese family to King Francis of France, with many other most beautiful statues. In addition to those niches, the said loggia is all wrought in stucco and has the walls and ceilings all painted with grotesques by the hand of Giovanni da Udine. At the head of this loggia Giulio painted in