alternatehistory.com

So when Pyotr the Great died, there were three branches of the Romanov family eligible to inherit the throne: the Ivanovichs (the descent of Tsar Ivan V, Pyotr's half-brother), the Alexeïevichs (the descent of Pyotr's son, Alexei) and the Petrovich/Skavronskaia (the descent of Pyotr's second marriage). By the time his daughter, Yelizaveta Petrovna died in 1761, the Alexeïevichs were extinct, and the Ivanovichs in jail (for complete extinction in 1807), and a female line descendant, Pyotr III (Yelizaveta's nephew), formerly Prince Karl Friedrich Ulrich of Holstein-Gottorp, became emperor establishing the new house of Romanov (which is actually a branch of the house of Oldenburg).

My challenge to you - in the 18th century, is that by 1799 to somehow unite all three lines (however you wish, but realistically, please) in one person - and that person is the Emperor of Russia.
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