Contains "tables giving years of rule and family relationships (in the male line unless otherwise indicated) for the reigning families of the world, from Horus Aha, first pharoah of Egypt, to Abdallah, present king of Saudi Arabia. Included in the tables are data regarding regencies and co-regencies, abdications and depositions, interregna and dynastic unions, mandates and protectorates, canonizations and beatifications, and the end of monarchic rule through conquest or overthrow. Notes provide information on chronological problems and uncertainties, non-Western dating systems, and names and titles; bibliographies document the research and guide the reader to additional information."