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In 1687 the Braganzas were near to extinction. The king Peter II, who deposed his brother Afonso VI, had just one daughter, Isabel Luísa, whose health wasn't good. His deposed brother had no children, neither his sister Catherine (who was the widow of Charles II of England and Scotland). So, he married again, this time with Maria Sofia of Neuburg, and saved the dinasty having 06 children who survived childhood.
But WI Peter II had before before his second marriage? Isabel becomes queen, but his health was very fragile (and this was the reason why no prince in Europe wanted to marry her). If she still dies in 1690 then the throne goes to Catharine, who also didn't have children. Supposing that Catherine still dies in 1705 as IOTL, who would be her successor?
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