| Country | Sovereign | Born | Acceded | ||
| Romania | King Michael I | 25 Oct | 1921 | 6 Sep | 1940 |
| Bulgaria | King Simeon II | 16 Jun | 1937 | 28 Aug | 1943 |
| Thailand | King Bhumibol Adulyadej | 5 Dec | 1927 | 9 Jun | 1946 |
| United Kingdom and Commonwealth Realms | Queen Elizabeth II | 21 Apr | 1926 | 6 Feb | 1952 |
| Egypt | King Ahmad Fuad II | 16 Jan | 1952 | 26 Jul | 1952 |
| Zanzibar | Sultan Jamshid bin Abdullah | 16 Sep | 1929 | 7 Jul | 1963 |
| Greece | King Constantine II | 6 Jun | 1940 | 6 Mar | 1964 |
| Brunei Darussalam | Sultan Sir Muda Hassanal Bolkiah Muizzadin Waddaulah | 15 Jul | 1946 | 5 Oct | 1967 |
| Maldives | Sultan Muhammad Nur ud-din | May | 1969 | ||
| Oman | Sultan Qabus bin Said | 18 Nov | 1942 | 23 Jul | 1970 |
| Iraq | King Ra'ad | 18 Feb | 1936 | 18 Oct | 1970 |
| Serbia | King Alexander II | 17 Jul | 1945 | 3 Nov | 1970 |
| Denmark | Queen Margrethe II | 16 Apr | 1940 | 14 Jan | 1972 |
| Sweden | King Carl XVI Gustaf | 30 Apr | 1946 | 19 Sep | 1973 |
| Ethiopia | Emperor Zere Yacob II | 15 Aug | 1953 | 1975 | |
| Spain | King Juan Carlos I | 5 Jan | 1938 | 22 Nov | 1975 |
| Portugal | King Duarte III | 14 May | 1945 | 24 Dec | 1976 |
| Burundi | Queen Rosa Paula Iribagiza | 20 Mar | 1934 | 1 May | 1977 |
| China | Emperor Hengzhen | 1944 | 1977 | ||
| Laos | King Soulivong Savang | 8 May | 1963 | Mar | 1980 |
| Iran | Shah Reza II Pahlavi | 31 Oct | 1960 | 27 Jul | 1980 |
| Brazil | Emperor Luiz I | 6 Jun | 1938 | 5 Jul | 1981 |
| Sikkim | Chogyal Wangchuk Namgyal, 13th Maharaja | 1 Apr | 1953 | 29 Jan | 1982 |
| Italy | King Vittorio Emanuele IV | 12 Feb | 1937 | 18 Mar | 1983 |
| Montenegro | King Nikola II | 7 Jul | 1944 | 24 Mar | 1986 |
| Swaziland | King Mswati III | 1968 | 25 Apr | 1986 | |
| Japan | Emperor Akihito | 23 Dec | 1933 | 7 Jan | 1989 |
| Liechtenstein | Prince Hans Adam II | 14 Feb | 1945 | 13 Nov | 1989 |
| Norway | King Harald V | 21 Feb | 1937 | 17 Jan | 1991 |
| Russia | Empress Maria I | 23 Dec | 1953 | 21 Apr | 1992 |
| Libya | King Muhammed al-Hasan ar-Rida al-Senussi | 20 Oct | 1962 | 28 Apr | 1992 |
| Turkey | Sultan Osman V | 18 Aug | 1912 | 12 Mar | 1994 |
| Germany | Emperor Georg Friedrich I | 10 Jun | 1976 | 25 Sep | 1994 |
| Lesotho | King Letsie III | 17 July | 1963 | 7 Feb | 1996 |
| Tunisia | King Muhammed Bey | 1928 | 1996 | ||
| Yemen | Sultan Ageel bin Muhammad al-Badr | 1973 | 6 Aug | 1996 | |
| Central African Empire | Emperor Bokassa II | 2 Nov | 1975 | 3 Nov | 1996 |
| Hawaii | King Quentin I Kawananakoa | 28 Sep | 1961 | 29 Jul | 1997 |
| Jordan | King Abdullah II | 30 Jan | 1962 | 7 Feb | 1999 |
| Bahrain | King Hamad bin Isa al-Khalifa | 28 Jan | 1950 | 6 Mar | 1999 |
| France | King Henri VII | 14 Jun | 1933 | 19 Jun | 1999 |
| Morocco | King Mohammed VI | 21 Aug | 1963 | 23 Jul | 1999 |
| Mexico | Emperor Maximilian II | 2 Mar | 1944 | 8 Aug | 1999 |
| Luxembourg | Grand Duke Henri | 16 Apr | 1955 | 7 Oct | 2000 |
| Nepal | King Gyanendra Bir Bikram Shah Dev | 7 Jul | 1947 | 4 Jun | 2001 |
| Cambodia | King Norodom Sihamoni | 14 May | 1953 | 14 Oct | 2004 |
| United Arab Emirates | President Sheikh Khalifa bin Zayed al-Nahyan, Emir of Abu Dhabi | 1948 | 3 Nov | 2004 | |
| Monaco | Prince Albert II | 14 Mar | 1958 | 6 Apr | 2005 |
| Korea | Emperor Yi Won | 1962 | 16 Jul | 2005 | |
| Saudi Arabia | King Abdullah | 1924 | 1 Aug | 2005 | |
| Kuwait | Emir Sheikh Sabah al-Ahmad al-Sabah | 24 Jan | 2006 | ||
| Bhutan | King Jigme Khesar Namgyal Wangchuk | 21 Feb | 1980 | 15 Dec | 2006 |
| Samoa | Tupua Tamasese Tupuola Tufuga Efi, O le Ao o le Mao | 1 Mar | 1938 | 16 Jun | 2007 |
| Afghanistan | King Ahmed Shah Khan | 23 Sep | 1934 | 23 Jul | 2007 |
| Vietnam | Emperor Bao Thang | 30 Sep | 1943 | 28 Jul | 2007 |
| Georgia | King David XIII | 24 Jun | 1976 | 16 Jan | 2008 |
| Austria-Hungary | Emperor Karl II | 11 Jan | 1961 | 4 Jul | 2011 |
| Albania | King Leka II | 26 Mar | 1982 | 30 Nov | 2011 |
| Malaysia | Paramount Ruler Abdul Halim | 28 Nov | 1927 | 13 Dec | 2011 |
| Tonga | King ʻAhoʻeitu ʻUnuakiʻotonga Tukuʻaho | 12 Jul | 1959 | 18 Mar | 2012 |
| Netherlands | King Willem-Alexander | 27 April | 1967 | 30 April | 2013 |
| Qatar | Emir Tamim bin Hamad ath-Thani | 3 Jun | 1980 | 25 Jun | 2013 |
| Belgium | King Philippe I | 15 Apr | 1960 | 21 Jul | 2013 |
| Spain | King Felipe VI | 30 Jan | 1968 | 19 Jun | 2014 |
Today (Actual)
One Hundred Years Ago
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