A millennium ago, Baghdad was the capital of one of history's greatest civilizations. A new Islamic era was under way. Yet despite the profound cultural achievements, many Muslims felt their society had gone astray. Shiˀa Muslims challenged the dominant narrative of Islamic success with stories of loss. Faithful Muslims have long debated whether Sunni caliphs or Shiˀa imams were the true heirs of the Prophet Muhammad. More influential has been the way Muslim communities remembered those disputes through stories that influenced how to think and feel about them, Matthew Pierce...