Tudors or Beauforts?

In Royal Marriage Secrets, John picks up the intriguing question raised some years ago by Professor Colin Richmond that the so-called ‘Tudor’ royal family were actually not Tudors, because the real father of Edmund Tudor, Earl of Richmond, was not Owen Tudor but Edmund Beaufort (later Duke of Somerset).

In support of this argument, John cites new evidence, namely the coats of differenced royal arms, granted to Edmund and Jasper ‘Tudor’ by their half-brother, Henry VI.

If they were Tudors, Edmund and Jasper were not descendants of the English royal family, and therefore had no hereditary right to such arms. They should in fact have used versions of the completely different coat of arms borne by Owen Tudor.

But if their real father was Edmund Beaufort, they would have had some claim to differenced royal arms.

There is absolutely no surviving evidence that Catherine of France (mother of Henry VI and of Edmund and Jasper) ever married Owen Tudor.

But for those who maintain that Edmund and Jasper were the sons of Owen Tudor, their grant of differenced royal arms by Henry VI could raise a potentially interesting modern question.

Should Tom Parker Bowles (son of HRH the Duchess of Cornwall) be granted the royal arms, differenced by the addition of a bordure?