Prince Louis of Cambridge Prince Louis of Cambridge Prince Louis of Cambridge (Louis Arthur Charles; ; born 23 April 2018) is a member of the British royal family. He is the third and youngest child and second son of Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge. He is fifth in the line of succession to the British throne. Kensington Palace announced on 4 September 2017 that the Duke and Duchess of Cambridge were expecting their third child. A son was born at 11:01 BST (10:01 UTC) on 23 April 2018. He was first seen in public seven hours after his birth,
Prince William, Duke of Cambridge Queen granted to the Duke and Duchess of Cambridge a conjugal coat of arms consisting of their individual arms displayed side-by-side beneath a helm and coronet denoting the Duke's status as grandson of the Sovereign. In 2011, the Canadian Heraldic Authority introduced a personal heraldic flag for the Duke of Cambridge's use in Canada. It is the Royal Arms of Canada in banner form defaced with a blue roundel surrounded with a wreath of gold maple leaves and shells within which is a depiction of a ""W"" surmounted by a coronet. Above the roundel is a white label of three