These three reigning monarchies are covered by this volume, which traces the House of Orange-Nassau from Willem IV, Prince of Orange, born 1711, to the present day Queen of the Netherlands. It also covers Belgium, from King Leopold I, whose Saxe-Coburg ancestry is traced in the respective volume, to the current King Albert II. The Grand Duchy of Luxembourg is covered from the first independent Grand Duke, Adolphus, whose Nassau-Weilburg ancestry is traced in the Netherlands section of this volume, to the current sovereign, Grand Duke Henri.