George IV of England reigned from 1820 to 1830.
Suppose his daughter, Princess Charlotte did not die in childbirth in 1817.
Suppose she and her husband, Prince Leopold of Saxe-Coburg, are still married.
Thus in 1830, Charlotte becomes the Queen Regnant of England. Prince Leopold is now her consort.
Who will be chosen as the first King of the Belgians?