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In page Princess Marie Louise of Schleswig-Holstein:

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Her parents resided in the United Kingdom, and the Princess was considered a member of the British royal family. Under Royal Warrant of 15 May 1867, the children of Prince and Princess Christian were to be styled "Highness". From her birth in 1872 therefore Princess Marie Louise was styled Her Highness Princess Marie Louise of Schleswig-Holstein, albeit only in the United Kingdom. She was known to her family as "Louie".[citation needed]