3. Grand Duchess Tatiana Nikolaevna of Russia
Grand Duchess Tatiana Nikolaevna, the second daughter of Tsar Nicholas II and Tsarina Alexandra, was once considered a prime candidate for a powerful marriage alliance. However, following the Russian Revolution and the tragic demise of the Romanov family, her unique personality and role were overshadowed by post-revolution legends and the stories of her sisters. This has led to her fading into the annals of forgotten history, despite her significant potential and contributions during her lifetime (en.wikipedia.org).