"[...] the author's command of medieval Islamic history and his thorough synthesis of a large volume of Islamic and Western sources to establishhis findings are strinkingly impressive. HE fruitfully combined the work of many Muslim jurists, renowned medieval historians and geographers in the medieval era."
Seif Tag Eddin in: The Muslims World Book Review 4/2007
"[...] the subject matter dealt with here is one of great historical significance [...]."
Maya Shatzmiller in: Der Islam (Redaktion) Asien-Afrika-Institut 85, 2-2008