Prince Louis was born at 11:01 BST on 23 April 2018 in St Mary's Hospital, London, during the reign of his paternal great-grandmother, Queen Elizabeth II, as the third child and second son of Prince William and Catherine, then known as Duke and Duchess of Cambridge.

[7] Louis was christened on 9 July by the archbishop of Canterbury, Justin Welby, in the Chapel Royal at St James's Palace.

[9] The family relocated to Adelaide Cottage in Windsor Home Park in 2022,[12] after which he started attending Lambrook, an independent preparatory school in Berkshire, along with his older siblings, Prince George and Princess Charlotte.

[13][14] Louis also accompanied his siblings and parents for Elizabeth II's Platinum Jubilee celebrations.

[20] Louis is fourth in the line of succession to the British throne, behind his father and two elder siblings, George and Charlotte.