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Origin of the UK Union Jack Flag

The Union Flag was originally a Royal flag. When the present design was made official in 1801, it was ordered to be flown on all the King's forts and castles, but not elsewhere.

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  • As @[email protected] said:

    Also interesting to note is that the red diagonals aren't centred within the white, which means it's possible (and surprisingly common) for people to fly it upside down by accident.