Lord Louis Mountbatten was also particularly close with Prince Charles, whom the Prince of Wales saw as his mentor.
The name Louis was also given to the eldest of the Cambridge children.
Prince George, seven, is likely to eventually become the seventh King of that name to reign the nation, following the Queen’s father King George VI and grandfather King George V.
Prince George’s full name is George Alexander Louis.
Louis was also chosen as Prince William’s third middle name when he was born.
Prince Louis’ second name, Arthur, is also of historical significance and a nod to Prince Charles.