What day did the son of Lady Margaret Beufort seize the English crown?
Lady Margaret's Professor of Divinity (Cambridge):  It was founded initially as a readership by Lady Margaret Beaufort, mother of Henry VII, in 1502. 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.
22 August 1485