https://en.wikipedia.org/wiki/Henry_VI_of_England
Henry was born on 6 December 1421 at Windsor Castle, the only child and heir of King Henry V.Succeeding to the throne as King of England at the age of nine months on 1 September 1422, the day after his father's death; he remains the youngest person ever to succeed to the English throne. On 21 October 1422, in accordance with the Treaty of Troyes of 1420, he became titular …