Ahmad ibn Tulun (835-84), the son of a Turkic slave in the Abbasid court of Baghdad, became the founder of the first independent state in Egypt since antiquity, and builder of Egypt's short-lived third capital of the Islamic era, al-Qata'i' and its great congregational mosque. After recounting the story of Ibn Tulun and his successors, architectural historian Tarek Swelim presents a topographic survey of al-Qata'i', a city lost since its complete destruction in 905. He then provides a detailed architectural analysis of the Mosque of Ibn Tulun, which was spared the destruction and is now the...