There were heroic lives and deaths before and after, but none quite like Socrates'. He did not die by sword or spear, braving all to defend home and country, but as a condemned criminal, swallowing a painless dose of poison. And yet Socrates' death in 399 BCE has figured large in our world ever since, shaping how we think about heroism and celebrity, religion and family life, state control and individual freedom, the distance of intellectual life...