- Son of Prince William of Wales and Catherine Princess of Wales.
- Grandson of Michael Middleton and Carole Middleton.
- Great-grandson of Queen Elizabeth II and Prince Philip.
- Nephew of Pippa Middleton, and James Middleton.
- Great-great grandson of King George VI and Queen Elizabeth the Queen Mother.
- Third great-grandson of King George V and Queen Mary.
- Grandson of King Charles III and Princess Diana.
- Fourth great-grandson of King Edward VII and Queen Alexandra, and King George of Greece and Queen Olga. King George was the brother of Queen Alexandra; he and Olga were the grandparents of Prince George's great-grandfather, Prince Philip.
- Younger brother of Prince George of Wales and Princess Charlotte of Wales.
- Prince Louis is fifth in the line of succession to the British throne, behind his grandfather, father and older siblings, Prince George and Princess Charlotte. Following the implementation of the Perth Agreement, which replaced male-preference primogeniture with absolute primogeniture, he is the first British prince to be ranked behind an elder sister in the line of succession.
- At the time he was born and named, it was rightly stated that his name is pronounced "Loo-ee" (and not "Loo-ess").
- He would not have been entitled to a princely title and "Royal Highness" style at birth, as the letters patent in effect (not anticipating four generations being alive) only gave such a status to the oldest son of the Prince of Wales' oldest son. His great-grandmother Queen Elizabeth II issued new letters patent on 31 December 2012, giving all of Prince William's children the style.
- At five years old he was already dubbed a "national treasure" by a royal expert.
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