In her adult life Cleopatra would have met few people she considered her equal. To the Romans she was a stubborn, supreme exception to every rule. She remains largely incomparable: She had plenty of predecessors, few successors. With her, the age of empresses essentially came to an end. In two thousand years only one or two other women could be said to have wielded unrestricted authority over so vast a realm. Cleopatra remains nearly alone at the all-male table, in possession of a hand both flush and flawed. She got a very good deal right, and one crucial thing wrong.