Marcus Licinius Crassus (115-53 BCE) was a modern man in an ancient world, a pioneer disrupter of finance and politics, and the richest man of the last years of the Roman republic. Without his catastrophic ambition, this trailblazing tycoon might have quietly entered history as Rome's first modern political financier. Instead, Crassus and his son led an army on an unprovoked campaign against Parthia into what are now the borderlands of Turkey, Syria,...