Son of Owen Tudor and Katherine of Valois (widow of Henry V) and half brother of Henry VI. Brother of Edmund Tudor (father of the future Henry VII). Jasper played a major role on behalf of the Lancastians in the Wars of the Roses and was with his nephew Henry Tudor in exile in Brittany. He married during Henry VII's reign, but had no legitimate heir. He may have fathered an illegitimate daughter named Ellen.