A couple days ago I was browsing at Wheaton College Library when I came across a book about the reigning monarchs of the world as of the turn of the 20th century. The book was written about the monarchs & was published in the year 1902. It goes over such monarchs as Edward VII, The Dowager Empress Ci-Xi & Emperor Guangxu of China (although, as predicted the information on the Dowager was not flattering), King Chulalongkorn of Siam (Thailand) Emperor Meiji of Japan, King Christian IX of Denmark, Sultan Abdul Hamid II of Turkey, King Oscar II of Sweden, Pope Leo XIII, King George I of Greece, Kaiser Wilhelm II of Germany, Emperor Franz Joseph of Austria, and numerous other monarchs. Even thought the information is somewhat innacurate, there was an interesting section of Nicholas & Alexandra. Oh yeah, the book is called "Living Rulers of Mankind" by Rev. H.N. Hutchinson.
[edited to add title info to subject line]