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From 1903 until 1957, this holiday in honor of the British Empire was known as Empire Day and celebrated on May 24, Queen Victoria‘s birthday. Between 1958 and 1966, it was called British Commonwealth Day. Then it was switched to Queen Elizabeth II‘s official birthday in June, and the name was shortened to Commonwealth Day. It is now observed annually on the second Monday in March. In Canada it is still celebrated on May 24 (or the Monday before) and referred to as Victoria Day. Discuss
Source: The Free Dictionary