Edited sentence: An argument against the claim might make the point that such pickiness amounts to wilfully ignoring reality.Being King in fact should be all the "legitimacy" anyone needs.He and his descendants could therefore legitimately claim the right of conquest.Henry was king because he made himself king and there was no other claimant with the strength to dispute him.Henry's choice of Edward IV's daughter as his wife may have been a "boost" to his legitimacy, but it was not why he was king.In addition, the current Royal family claims descent from Henry VII, who came to the throne after defeating Richard III, a king whose legitimacy is not in dispute