Her palace shimmered with onyx and gold but was richer still in political and sexual intrigue. Above all else, Cleopatra was a shrewd strategist and an ingenious negotiator. She was married twice, each time to a brother. She waged a brutal civil war against the first and poisoned the second; incest and assassination were family specialties. She had children by Julius Caesar and Mark Antony, two of the most prominent Romans of the day. With Antony...