A Sienese gentleman had commissioned Cellini to make him a golden medal, to be worn in the hat. "The subject was to be Hercules wrenching the lion's mouth. While I was working at this piece, Michel Agnolo Buonarroti came oftentimes to see it. I had spent infinite pains upon the design, so that the attitude of the figure and the fierce passion of the beast were executed in quite a different style from that of any other craftsman who had hitherto attempted such groups. This, together with the fact that the special branch of art was totally unknown to Michel Agnolo, made the divine master give such praises to my work that I felt incredibly inspired for further effort. "Just then I met with Federigo Ginori, a young man of very lofty spirit. He had lived some years in Naples and being endowed with great charms of person and presence, had been the lover of a Neopolitan princess. He wanted to have a medal made with Atlas bearing the world upon his shoulders, and applied to Michel Agnolo for a design. Michel Agnolo made this answer: 'Go and find out a young goldsmith named Benvenuto; he will serve you admirably, and certainly he does not stand in need of sketches by me. However, to prevent your thinking that I want to save myself the trouble of so slight a matter, I will gladly sketch you something; but meanwhile speak to Benvenuto and let him also make a model; he can then execute the better of the two designs.' Federigo Ginori came to me and told me that he wanted, adding thereto how Michel Agnolo had praised me, and how he had suggested I should make a waxen model while he undertook to supply a sketch. The words of that great man so heartened me, that I set myself to work at once with eagerness upon the model; and when I had finished it, a painter who was intimate with Michel Agnolo, called Giuliano Bugiardini, brought me the drawing of Atlas. On the same occasion I showed Giuliano my little model in wax, which was very different from Michel Agnolo's drawing; and Federigo, in concert with Bugiardini, agreed that I should work upon my model. So I took it in hand, and when Michel Agnolo saw it, he praised me to the skies."
Symonds, John Addington: "The Life of Michelangelo Buonarroti", Modern Library (New York), p.259-261