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Empress Elizabeth of Russia settled on Princess Sophie of Anhalt-Zerbst as a bride for her nephew and heir, Peter (future Peter III).
Sophie (as Catherine) married Peter in 1745. Elizabeth died in 1762.
Suppose Empress Elizabeth chooses a different lady to be the wife of Peter.
Suppose Elizabeth settles on Princess Charlotte Amalie of Hesse-Philippsthal. Charlotte Amalie (1730-1801) was the daughter of Landgrave Charles I of Hesse-Philippsthal.
What happens then?