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Prince Louis of Cambridge (Louis Arthur Charles; born April 23, 2018) is a member of the British Royal Family. He is the third and youngest child and second son of the Duke of Cambridge, and Duchess of Cambridge. He is fifth in the line of succession to the British throne.


On April 27, 2018, it was announced that the baby had been named Louis Arthur Charles, the first and last names honouring his paternal great-great-great-uncle Lord Mountbatten (born HSH Prince Louis of Battenberg) and his paternal grandfather the Prince of Wales, respectively.


Title and succession

Louis is from birth a Prince of the United Kingdom, entitled to the style of Royal Highness. Under the 1917 Letters Patent issued by King George V (1910-1936) Louis would not have been entitled without the dignity Prince of the United Kingdom and the style of Royal Highness.

The Letters Patent, dated November 30, 1917, stated that “the children of any Sovereign of these Realms and the children of the sons of any such Sovereign (as per the Letters Patent of 1864) and the eldest living son of the eldest son of the Prince of Wales (a modification of the Letters Patent of 1898) shall have and at all times hold and enjoy the style, title or attribute of Royal Highness with their titular dignity of Prince or Princess prefixed to their respective Christian names or with their other titles of honour”.


Louis, as a younger son of the eldest living son of the eldest son of the Prince of Wales he would not have met the requirements to be a Prince of the United Kingdom. It was very rare that a reigning sovereign would live long enough to have great-grand children. The birth of Princess Charlotte was the first British Royal to have been exempted from a title under the 1917 Letters Patent.

On December 31, 2012 Queen Elizabeth II made an amendment to the 1917 Letters Patent by issuing a Letters Patent which gave the title and style His/Her Royal Highness and Prince/Princess of the United Kingdom to all the children of the Prince of Wales’s eldest son. Therefore at birth Louis was thus styled “His Royal Highness Prince Louis of Cambridge”.

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.


Prince Louis, is the first British Prince to be ranked behind an elder sister in the line of succession following the implementation of the Perth Agreement.

The Perth Agreement is an agreement made by the prime ministers of the sixteen countries of the Commonwealth of Nations which retain the Westminster model of constitutional monarchy (“the Commonwealth realms”). The document agreed to amend the succession to the British throne (and ancillary matters). The institutional and constitutional principles of Commonwealth realms are greatly and at root shared equally as enacted in 1931. The changes, in summary, comprised: replacing male-preference primogeniture ― under which males take precedence over females in the royal succession ― with absolute primogeniture (which does not distinguish gender as a succession criterion); ending disqualification of any person who had married Roman Catholics; and that only six people closest to the throne require the monarch’s permission to marry.