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The POD is that between the Battle of Towton and time in OTL he first meets Elizabeth Woodville. Edward IV marries the Lady Eleanor Talbot and then has it publicly announced.
I wonder how Richard Neville (The Kingmaker) would have reacted to this marriage. Because Eleanor's mother Margaret was the half-sister of his wife (Anne Beauchamp), therefore Eleanor Talbot was the Kingmaker's niece.
Not to mention that Eleanor unlike Elizabeth Woodville had only two siblings still alive namely Sir Humphrey Talbot and Elizabeth Duchess of Norfolk. Only Humphrey befitting a sibling of the Queen would need to be given at least an Earldom.