Queen Victoria was born on May 24, 1819.
The monarch's birthday has been celebrated, in Canada, since before the beginning of Queen Victoria's reign.  After her death, in 1901, May 25 became known as Empire Day.  In 1952, Empire Day was moved to the Monday before May 25 and, since 1953, the official birthday of Queen Elizabeth II has been celebrated on this date in Canada.  In 1958, Empire Day became known as Commonwealth Day, which was moved to the second Monday in March.  The Monday before May 25 then became known as Victoria Day, which is a Canadian statutory holiday.