Country | Sovereign | Born | Acceded | Consort | Heir |
Kingdom of Swaziland | King Sobhuza II | 22 Jul 1899 | 10 Dec 1899 | (70 wives) | |
State of Japan | Emperor Hirohito | 29 Apr 1901 | 25 Dec 1926 | Empress Nagako (1903) | Crown Prince Akihito (1933) |
Principality of Liechtenstein | Prince Franz Joseph II | 16 Aug 1906 | 25 July 1938 | Princess Georgina (1921) | Her. Pr. Hans Adam (1945) |
Imperial State of Iran | Shah Mohammad Reza Pahlavi | 26 Oct 1919 | 16 Sep 1941 | Empress Farah (1938) | Crown Prince Reza (1960) |
Kingdom of Thailand | King Bhumibol Adulyadej | 5 Dec 1927 | 9 Jun 1946 | Queen Sirikit (1932) | Crown Prince Vajiralongkorn (1952) |
Kingdom of the Netherlands | Queen Juliana | 30 Apr 1909 | 4 Sep 1948 | Prince Bernhard (1911) | Princess Beatrix (1938) |
Principality of Monaco | Prince Rainier III | 31 May 1923 | 9 May 1949 | Princess Grace (1929) | Her. Pr. Albert (1958) |
Kingdom of Belgium | King Baudouin I | 7 Sep 1930 | 16 Jul 1951 | Queen Fabiola (1928) | Prince Albert (1934) |
United Kingdom of Great Britain & Northern Ireland
Canada | Queen Elizabeth II | 21 Apr 1926 | 6 Feb 1952 | Prince Philip, Duke of Edinburgh (1921) | Prince Charles, Prince of Wales (1948) |
Hashemite Kingdom of Jordan | King Hussein | 14 Nov 1935 | 11 Aug 1952 | Queen Noor (1951) | Crown Prince Hassan (1947) |
Kingdom of Norway | King Olav V | 2 Jul 1903 | 21 Sep 1957 | Crown Prince Harald (1937) | |
Kingdom of Lesotho | King Moshoeshoe II | 2 May 1938 | 12 Mar 1960 | Queen 'Mamohato (1941) | Prince Letsie (1963) |
Kingdom of Morocco | King Hassan II | 9 Jul 1929 | 3 Mar 1961 | Princess Lalla Latifa (1946) | Crown Prince Mohammed (1963) |
Emirate of Bahrain | Emir Isa ibn Salman Al Khalifa | 3 Jun 1933 | 2 Nov 1961 | Crown Prince Hamad (1950) | |
Independent State of Western Samoa | Malietoa Tanumafili II | 4 Jan 1913 | 15 Apr 1962 | Lili Tunu | |
Vatican City | Pope Paul VI | 26 Sep 1897 | 21 Jun 1963 | ||
Grand Duchy of Luxembourg | Grand Duke Jean | 5 Jan 1921 | 12 Nov 1964 | Grand Duchess Josephine- Charlotte (1927) | Her. GD. Henri (1955) |
Kingdom of Tonga | King Tāufaʻāhau Tupou IV | 4 Jul 1918 | 16 Dec 1965 | Queen Halaevalu Mataʻaho ʻAhomeʻe (1926) | Crown Prince Siaosi Tupou (1948) |
Sultanate of Oman | Sultan Qabus bin Said | 18 Nov 1940 | 23 Jul 1970 | Princess Kamila (1951) | |
United Arab Emirates | President Sheikh Zayed bin Sultan Al Nahyan | 6 May 1918 | 2 Dec 1971 | Crown Prince Khalifa (1948) | |
Kingdom of Denmark | Queen Margrethe II | 16 Apr 1940 | 14 Jan 1972 | Prince Henrik (1934) | Crown Prince Frederik (1968) |
Kingdom of Nepal | King Birendra | 29 Dec 1944 | 31 Jan 1972 | Queen Aishwarya (1949) | Crown Prince Dipendra (1971) |
State of Qatar | Emir Khalifa bin Hamad al-Thani | 17 Sep 1930 | 22 Feb 1972 | Crown Prince Hamad (1952) | |
Kingdom of Bhutan | King Jigme Singye Wangchuk | 11 Nov 1955 | 21 Jul 1972 | ||
Kingdom of Sweden | King Carl XVI Gustaf | 30 Apr 1946 | 15 Sep 1973 | Queen Silvia (1943) | Prince Bertil (1912) |
Kingdom of Saudi Arabia | King Khalid | 13 Feb 1913 | 25 Mar 1975 | Crown Prince Fahd (1921) | |
Federation of Malaysia | Paramount Ruler Sultan Yahya Petra | 10 Dec 1917 | 21 Sep 1975 | Raja Perempuan Zainab (1917) | |
Kingdom of Spain | King Juan Carlos I | 5 Jan 1938 | 22 Nov 1975 | Queen Sofia (1938) | Felipe, Prince of Asturias (1968) |
Central African Empire | Emperor Bokassa I | 22 Feb 1921 | 4 Dec 1976 | Empress Catherine | Crown Prince Jean-Bédel (1973) |
State of Kuwait | Emir Jaber Al-Ahmad Al-Jaber Al-Sabah | 29 Jun 1926 | 31 Dec 1977 | Crown Prince Saad (1930) |