This book discusses mosques built during the Fatimid era in Mahdia,Sirte, Ajdabiya, and Cairo, some of which remained intact and someof which were altered, and it is based on a treatise originally titled(Fatimid Mosques, Their History and Architecture). Given thesignificance of the mihrab in mosque architecture, I included anarticle titled “The Rightness in the Relationship Between the Mosqueand the Mihrab” that opened the book’s pages which were theintroduction pages of the book.