Book excerpt: The Compendium of World Sovereigns series contains three volumes: Ancient, Medieval, and Early Modern. These volumes provide students with easy-to-access ‘who’s who’ with details on the identities and dates, ages and wives, where known, of heads of government in any given state at any time within the framework of reference. The relevant original and secondary sources are also listed in a comprehensive bibliography. Providing a clear reference guide for students, to who was who and when they ruled in the dynasties and other ruler-lists for the Ancient, Medieval, and Early Modern worlds – primarily European and Middle Eastern but including available information on Africa and Asia and the pre-Columbian Americas. The trilogy accesses and interprets the original data plus any modern controversies and disputes over names and dating, reflecting on the shifts and widening of focus in student and academic studies. Each volume contains league tables of rulers’ ‘records’, and an extensive bibliographical guide to the relevant personnel and dynasties, plus any controversies, so readers can consult these for extra details and know exactly where to go for which information. All relevant information is collected and provided as a one-stop-shop for students wishing to check the known information about a world Sovereign. The Early Modern volume begins with Eastern and Western Europe and moves through the Ottoman Empire, South and East Asia, Africa, and ends in Central and South America. Compendium of World Sovereigns: Volume III Early Modern provides students and scholars with the perfect reference guide to support their studies and to fact check dates, people, and places.