ItwastheageofDaVinciandMichelangelo, ofenlightenedcreativityandunparalleledintellectualachievement.ButitwasalsotheageofMachievelli, oframpantlawlessness, incessantwarandunspeakabledepravity.AttheheartoftheworldorderwastheVatican, thearbiterofconflictsbetweenkingdomsandempires.AndatthecenteroftheVati...