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"Victoria Day [is a] Canadian holiday on which the British sovereign’s birthday is celebrated. In 1845, during the reign of Queen Victoria, May 24, the Queen’s birthday, was declared a holiday in Canada. After Victoria’s death in 1901, an act of the Canadian Parliament established Victoria Day as a legal holiday, to be celebrated on May 24 (or on May 25 when May 24 fell on a Sunday)." Victoria Day in modern times is observed as the Monday preceding May 25 (https://www.britannica.com/topic/Victoria-Day).