His most famous work has representations of Day, Night, Dawn and Dusk carved in relief on its base, contains a small temple with a reclining figure atop it, and depicts Neptune and Ceres reclining and looking at each other on its top.  
In a relief work that used to reside under the pedestal of another of his sculptures, a figure flying in from the top of the scene is about to slash his sword at the dragon poised to eat the title character.  Besides sculpting The Freeing of Andromeda, this man's Crucifix, sculpted in white marble, was donated to Philip II of Spain and now rests in the Escorial.  His name is written across the sash (*) of one of his nudes, who holds by the hair the decapitated head of Medusa; that version of Perseus was commissioned by Cosimo de Medici.  His most famous work has representations of Day, Night, Dawn and Dusk carved in relief on its base, contains a small temple with a reclining figure atop it, and depicts Neptune and Ceres reclining and looking at each other on its top.  For 10 points, name this goldsmith of the Salt Cellar of Francis I.
In a relief work that used to reside under the pedestal of another of his sculptures, a figure flying in from the top of the scene is about to slash his sword at the dragon poised to eat the title character.  
Benvenuto {Cellini}