Beaufort, Margaret (1443–1509)

English noble. She was the granddaughter of John of Gaunt, Duke of Lancaster. In 1455 she married Edmund Tudor, Earl of Richmond, and their son became Henry VII of England.

Her father was John Beaufort, Duke of Somerset. After the death of Edmund she married Henry Stafford, son of the Duke of Buckingham. Her third husband, Thomas Stanley, Earl of Derby, defected from the Yorkists to the Lancastrians, aiding Henry's victory over Richard III at the battle of Bosworth 1485, which ended the Wars of the Roses.