Prince Louis Arthur Charles

Prince Louis is the youngest child of Prince William and Princess Kate. He was born in April 2018, seven years after the couple tied the knot.

The prince was fifth in line for the crown before his grandfather, King Charles III, inherited the throne in September 2022. He is now fourth in line following his father and his two older siblings, brother Prince George and sister Princess Charlotte. Louis beat out uncle Prince Harry and his children, Archie and Lili, in the line of succession.

All three of Louis’ monikers run in the British royal family, with his first name being a nod to Prince Philip’s late uncle Louis Mountbatten. It is also one of his brother George’s middle names. Arthur is a shared middle name with both his grandfather and father. Charles, of course, pays homage to the eldest son of Queen Elizabeth II.

Louis was born one year before his first cousin on William’s side, Archie Harrison, who arrived in May 2019. Harry and wife Meghan Markle later welcomed daughter Lilibet “Lili” Diana in June 2021.