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Sophia Dorothea of Hanover (1687-1757) was the only daughter of King George I of England.
Suppose her older brother George (born 1683) predeceases their father, King George I at a young age. Suppose George had not married.
Sophia Dorothea is married to Frederick William I of Prussia.
King George I of England dies.
Sophia Dorothea becomes the sovereign as Queen Sophia.
What happens then?