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Okay, this is an idea that I thought could be fun. Imagine Anne Boleyn succeeding Catherine of Aragon as queen - not because she is the new wife of the same husband, but because she is her daughter-in-law. I figure the most likely way to do this would be to have Catherine either have a son with Arthur, or to marry Henry ASAP (though the bottom end of the spectrum for Anne Boleyn's birth is around 1507, so a little wiggle-room I guess).