| Country | Sovereign or Heir | Born | Acceded | Spouse | Born | Married |
| Austria-Hungary | HIM Emperor Karl I | 17 Aug 1887 | 21 Nov 1916 | <HIM Empress Zita | 9 May 1892 | 21 Oct 1911 |
| Belgium | HM King Albert I | 8 Apr 1875 | 23 Dec 1909 | |||
|
Bulgaria | HM King Ferdinand I | 26 Feb 1861 | Prince 7 Jul 1887; King 5 Oct 1908 | HM Queen Eleonore (Princess Eleonore Reuss-Köstritz) | 22 Aug 1860 | 28 Feb 1908 |
| Denmark | HM King Christian X | 26 Sep 1870 | 14 May 1912 | HM Queen Alexandrine (Duchess Alexandrine of Mecklenburg-Schwerin) | 24 Dec 1879 | 26 Apr 1898 |
| Germany | HIM Emperor Wilhelm II | 27 Jan 1859 | 15 Jun 1888 | HIM Empress Auguste (Princess Auguste Viktoria of Schleswig-Holstein-Sonderburg-Augustenburg) | 22 Oct 1858 | 27 Feb 1881 |
| Greece | HM King Alexander | 1 Aug 1893 | 11 Jun 1917 | |||
| Italy | HM King Vittorio Emanuele III | 11 Nov 1869 | 29 Jul 1900 | HM Queen Helena (Princess Elena of Montenegro) | 8 Jan 1873 | 24 Oct 1896 |
| Liechtenstein | HSH Prince Johann II | 5 Oct 1840 | 12 Nov 1858 | |||
| Luxembourg | HRH Grand Duchess Marie Adelaide | 14 Jun 1894 | 25 Feb 1912 | |||
| Monaco | HSH Prince Albert | 13 Nov 1848 | 10 Sep 1889 | (1) Princess Mary (Lady Mary Douglas-Hamilton) (2) Princess Alice (Alice Heine, Duchesse de Richelieu) | 11 Dec 1850 10 Feb 1858 | 21 Sep 1869 (div 1880) 30 Oct 1889 (sep 1902) |
| Montenegro | HM King Nikola I | 7 Oct 1841 | 13 Aug 1860 | HM Queen Milena (Milena Vukotic) | 4 May 1847 | 8 Nov 1860 |
| Netherlands | HM Queen Wilhelmina | 31 Aug 1880 | 23 Nov 1890 (reached majority 31 Aug 1898) | HRH Prince Hendrik (Duke Heinrich of Mecklenburg-Schwerin) | 19 Apr 1876 | 7 Feb 1901 |
| Norway | HM King Haakon VII (Prince Carl of Denmark) | 3 Aug 1872 | 18 Nov 1905 | HM Queen Maud (Princess Maud of Great Britain) | 26 Nov 1869 | 22 Jul 1896 |
| Romania | HM King Ferdinand I | 24 Aug 1864 | 10 Oct 1914 | HM Queen Marie (Princess Marie of Saxe-Coburg & Gotha) | 29 Oct 1875 | 10 Jan 1893 |
| Serbia | HM King Peter I | 11 Jul 1844 | 12 Jun 1903 | |||
| Spain | HM King Alfonso XIII | 17 May 1886 | 17 May 1886 (reached majority 17 May 1902) | HM Queen Victoria Eugenia (Princess Victoria Eugenie of Battenberg) | 24 Oct 1887 | 31 May 1906 |
| Sweden | HM King Gustaf V | 16 Jun 1858 | 8 Dec 1907 | HM Queen Victoria (Princess Viktoria of Baden) | 7 Aug 1862 | 20 Sep 1881 |
| United Kingdom | HM King George V | 3 Jun 1865 | 6 May 1910 | HM Queen Mary (Princess May of Teck) | 26 May 1867 | 6 Jul 1893 |
| Bavaria | HM King Ludwig III | 7 Jan 1845 | 5 Nov 1913 | |||
| Saxony | HM King Friedrich August III | 25 May 1865 | 15 Oct 1904 | Luise, Countess of Montignoso (Archduchess Luise of Austria-Tuscany) | 2 Sep 1870 | 21 Nov 1891 (div 11 Feb 1903) |
| Württemberg | HM King Wilhelm II | 25 Feb 1848 | 6 Oct 1891 | HM Queen Charlotte (Princess Charlotte zu Schaumburg-Lippe) | 10 Oct 1864 | 8 Apr 1886 |
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