Upon his return from France to his hometown Florence in 1545, Benvenuto cast a bronze bust of Cosimo I Medici, the Grand Duke of Tuscany. On this statue, Cellini crafted three anthropomorphic heads on to the armour of the duke. The first of them is "grotesque" situated on the right shoulder of Cosimo. The decorative head is composed of lineaments of a satyr, lion and a man. Two other heads, much smaller than the first and almost identical, can be found beneath the collarbones on the bust's front. His most distinguished sculpture is the bronze group of "Perseus with the Head of Medusa", a work (first suggested by Duke Cosimo I de Medici) now in the Loggia dei Lanzi at Florence, his attempt to surpass Michelangelo's "David" and Donatello's "Judith and Holofernes". The casting of this work caused Cellini much trouble and anxiety, but it was hailed as a masterpiece as soon as it was completed. The original relief from the foot of the pedestal—Perseus and Andromeda—is in the Bargello, and has been replaced by a cast.