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In 1554 the third wife of Sigismund II of Poland, Catherine of Austria, suffered a miscarriage. Since then the king believed his marriage was cursed, as he had marriage before Catherine's sister, Elisabeth of Austria, he tried to have it annulled, but without success.
But WI Catherine didn't suffer the miscarriage, and gives birth to a healthy child, a daughter? Of course, she wouldn't be the male heir he wanted to keep the Jagiellon dynasty alive, but she would be his only issue, and probably would make everything possible to ensure that her future line have the throne. How would it affect Poland and Lithuania? And, assuming that Sigismund still lives until 1572 as IOTL, who would he choose to be the husband of his daughter and future king of Poland?
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