Description of the book The Lexicon of Genealogies and Ruling Dynasties in the Islamic History of the Orientalist Zampauer. This book by the Austrian Orientalist Professor Eduard von Zampauer is considered a major research effort and an important reference for those working in the study of Islamic history and archeology. This book tells us about the ruling families in the countries of the Islamic world, and two copies were issued, one in German and the other in French, and then it was translated into Arabic to become an important reference for many Arab researchers and an important step that affected this field, especially since the author Zampauer relied on one of the most prominent reference books, which is complete in history Ibn al-Atheer and other important reference books. However, the book is not without its error, although it does not affect the value of this book and its being a rich and important reference.