What day did the son of Lady Margaret Beufort seize the English crown?
Henry VII of England Henry VII (Welsh: "Harri Tudur" ; 28 January 1457 – 21 April 1509) was King of England from seizing the crown on 22 August 1485 until his death on 21 April 1509, and the first monarch of the House of Tudor. He ruled the Principality of Wales until 29 November 1489 and was Lord of Ireland.
William Adelin William Ætheling (] ; 5 August 1103 – 25 November 1120), designated or titled Adelin (alternately rendered as "Adelinus", "Adelingus", "A(u)delin" or other Latinised Norman-French variants of "Ætheling"), was the son of Henry I of England by his wife Matilda of Scotland, and was thus heir apparent to the throne. His early death without issue caused a succession crisis, known in history as The Anarchy.