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Imagine that Edward Augustus, the Duke of Kent and Strathearn, the fourth son of King George III of the United Kingdom had no children. So Victoria has never been born. That would mean that Ernest Augustus would follow his older brothers George IV and William IV on the throne of the United Kingdom. That would also mean that personal union between the United Kingdom and the Kingdom of Hanover was not dissolved. And it would mean that one of his successors (most likely Ernest Augustus II) will inherit the Duchy of Brunswick after the Death of Duke William VIII in 1884.
The List of Kings of the United Kingdom:
Ernest Augustus 1837-1851
George V 1851-1878
Ernest Augustus II 1878-1923
Ernest Augustus III 1923-1953
Ernest Augustus IV 1953-1987
Ernest Augustus V since 1987