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In page Elizabeth of Russia:

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No suitable groom could be found for Grand Duchess Elizabeth Petrovna. Candidates included August II the Strong's illegitimate son, Count Maurice de Saxe, who had already been unsuccessfully courted by Empress Anna, Prince George Augustus of England, Charles Friedrich Albrecht, Margrave of Brandenburg-Schwedt, Manuel of Portugal [who?], and even the Shah of Persia, Nader Shah. Elizabeth's illegitimate birth (her parents had officially married in 1712 when she was four years old) prevented her from marrying into the ruling dynasties, as did religious differences and her mother's lowly lineage.[citation needed]