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So we know that Charles XII did not get married throughout his life and had no heirs.
Is there any way you see him agreeing to a marriage alliance at some point?
Who are some of the best possible candidates, and what do they offer to him personally and politically?
What might the result of him having a child as an heir be to European politics? And would Charles maybe decide to be a bit smarter about dealing with Russia and less likely to jump into conflict?