"Vivam" is the very last word of Ovid's masterpiece, the Metamorphoses: "I shall live." If we're still reading it two millennia after Ovid's death, this is by definition a remarkably accurate prophecy. Ovid was not the only ancient author with aspirations to be read for eternity, but no poet of the Greco-Roman world has had a deeper or more lasting impact on subsequent literature and art than he can claim. In the present day no Greek or Roman poet...