(Top: King Leopold II of Belgium, King Alfonso XIII of Spain, President Emile Loubet of France, King Edward VII of the United Kingdom, King Carlos I of Portugal, King Christian IX of Denmark. Middle: Emperor Franz Joseph I of Austria-Hungary, King Oscar II of Sweden & Norway, Emperor Nicholas II of Russia, King Victor Emanuel III of Italy, Emperor Wilhelm II of Germany. Bottom: Sultan Abdul Hamid II of the Ottoman Empire, King George I of Greece, King Peter I of Serbia, King Carol I of Romania, Prince Ferdinand I of Bulgaria, Prince Nicholas I of Montenegro.)
| Country | Sovereign | Born | Acceded | ||
| Austria-Hungary | Emperor Franz Joseph I | 18 August | 1830 | 2 December | 1848 |
| Liechtenstein | Prince Johann II | 5 October | 1840 | 12 November | 1858 |
| Montenegro | Prince Nikola I | 7 October | 1841 | 13 August | 1860 |
| Greece | King George I | 24 December | 1845 | 27 June | 1863 |
| Denmark | King Christian IX | 8 April | 1818 | 16 November | 1863 |
| Belgium | King Leopold II | 9 April | 1835 | 17 December | 1865 |
| Romania | King Carol I | 20 April | 1839 | 20 April | 1866 |
| Sweden & Norway | King Oscar II | 21 January | 1829 | 18 September | 1872 |
| Ottoman Empire | Sultan Abdul Hamid II | 22 September | 1842 | 31 August | 1876 |
| Spain | King Alfonso XIII | 17 May | 1886 | 17 May | 1886 |
| Bulgaria | Prince Ferdinand I | 26 February | 1861 | 7 July | 1887 |
| Germany | Emperor Wilhelm II | 27 January | 1859 | 15 June | 1888 |
| Monaco | Prince Albert I | 13 November | 1848 | 10 September | 1889 |
| Portugal | King Carlos I | 28 September | 1863 | 19 October | 1889 |
| Luxembourg | Grand Duke Adolf | 24 July | 1817 | 23 November | 1890 |
| Netherlands | Queen Wilhelmina | 31 August | 1880 | 23 November | 1890 |
| Russia | Emperor Nicholas II | 18 May | 1868 | 1 November | 1894 |
| France | President Emile Loubet | 31 December | 1838 | 18 February | 1899 |
| Italy | King Vittorio Emanuele III | 11 November | 1869 | 29 July | 1900 |
| United Kingdom | King Edward VII | 9 November | 1841 | 22 January | 1901 |
| Serbia | King Peter I | 29 June | 1844 | 15 June | 1903 |
King Carlos I of Portugal (1863-1908) welcomes King Alfonso XIII of Spain (1886-1941) (obscured) to Lisbon in December 1903.
Photograph of Grand Duchess Alexandra Iosifovna (1830-1911) with her family in 1903 at the Palace of Strelna, the coastal residence of the Konstantinovich branch of the Russian Imperial family. She is sitting in a bath chair at the centre of the group, facing right and with a knitted blanket covering her legs. Standing beside her to the right linking arms are Queen Olga of the Hellenes (1851-1926), Grand Duchess Vera Constantinovna (1854-1912), Prince Gabriel Constantinovich (1887-1955), Grand Duchess Elisabeth Mavrikievna (1865-1927) and Prince John Constantinovich (1886-1918). Prince Christopher of Greece and Denmark (1888-1940) is sitting to the far right with a pram in the shape of a swan beside him. Grand Duke Constantine Constantinovich (1858-1915) is standing to the left of the bath chair with his arm around Princess Tatiana Constantinovna (1890-1979). Grand Duke Dimitri Constantinovich (1860-1919) is sitting beside him to the far left. Sitting on the floor at the front of the group are Prince Constantine Constantinovich (1891-1918), Prince Igor Constantinovich (1894-1918) and Prince Oleg Constantinovich (1892-1914).