Two Central African nations, Togo and Gabon, have officially become members of the Commonwealth.
When Queen Elizabeth became head of the Commonwealth in 1952, there were only 8 nations in the Commonwealth
70 years later, the Commonwealth of Nations is now 56 nations.
Last year, Barbados stopped pledging allegiance to Queen Elizabeth II as it lost another relic of its colonial past and became a republic for the first time in history.
Many politicians, dignitaries and artists attended the ceremony, including Prince Charles and singer Rihanna.
Jamaica has also "formally begun" its separation from the British monarchy.