The influence of the ancient Greek philosopher Socrates has been profound. Even today, over two thousand years after his death, he remains one of the most renowned humans to have ever lived—and his death remains one of the greatest unsolved mysteries.    There is another side to this story: impiety, lack of reverence for the gods, was a religious crime. From the perspective of the religious authorities of the time, the charge of impiety against Socrates was warranted. The priests did not tolerate scrutiny, even in the form of philosophical critique. To understand what happened and how it happened, we have to come to terms with the motives of the priests, and as importantly, Socrates’ motives in provoking them. His trial is perhaps first, but not last, great battle between philosophy and religion. To explore this mystery is today’s guest, Matt Gatton, author of “The Shadows of Socrates.”