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As the title says. There are a lot of threads drifting on the site about Charles II having legitimate issue. And a lot about the duke of York having a son but dying soon after. So, what if we combine the two?
Catherine of Bragança carries one of her pregnancies (1666, 1668 or 1669) to term and produces a healthy Prince of Wales. I particularly find the story funny that during her illness in 1663 she thought she had given birth to a son and apologized to Charles that the boy was so ugly.
Charles dies of natural causes before the decade is out and leaves his Catholic wife and underage son behind. I imagine the duke of York is regent, but in the early 1670s has the glamour of a naval hero worn off? Or might he still be able to get some public sympathy? What part, if any, would Catherine play in a regency for young Charles III?