For four days the mob rampaged through the city. The citizens of Medina cowered in their houses, waiting for the violence to die down. Even when the uproar faded, the leaders of the mob said they would not quit town until a new khalifa was appointed, someone they could trust. Now, at last, all thoughts turned to the one candidate who had been passed over time after time, the man some had always called the Prophet’s only legitimate successor: Mohammed’s son-in-law Ali.