Suzanna Catharina de Graaff's claim of being the fifth daughter of Tsar Nicholas II and Tsarina Alexandra, was accepted by one of several imposters who clamed to be who?
Grand Duchess Anastasia of Russia
Title: Anna Anderson
Passage: Anna Anderson (16 December 1896 – 12 February 1984) was the best known of several impostors who claimed to be Grand Duchess Anastasia of Russia.  Anastasia, the youngest daughter of the last Tsar and Tsarina of Russia, Nicholas II and Alexandra, was killed along with her parents and siblings on 17 July 1918 by communist revolutionaries in Yekaterinburg, Russia; but the location of her body was unknown until 2007.
Title: Maria Rasputin
Passage: Maria Rasputin (baptized as Matryona Grigorievna Rasputina) (26 March 1898 – 27 September 1977) was the daughter of Grigori Rasputin and his wife Praskovia Fyodorovna Dubrovina.  She wrote two memoirs about her father, dealing with Tsar Nicholas II and Tsarina Alexandra Feodorovna, the attack by Khionia Guseva and the murder.  A third one, "The Man Behind the Myth", was published in 1977 in association with Patte Barham.  In her three memoirs, the veracity of which has been questioned, she painted an almost saintly picture of her father, insisting that most of the negative stories were based on slander and the misinterpretation of facts by his enemies.
Title: Suzanna Catharina de Graaff
Passage: Suzanna Catharina de Graaff, born Suzanna Catharina Hemmes, (5 May 1905, in Rotterdam – 25 November 1968), was a Dutch woman who claimed to be a fifth daughter of Tsar Nicholas II and Tsarina Alexandra.  Her claim was accepted by Anna Anderson, who claimed to be Grand Duchess Anastasia Nikolaevna of Russia, but by few others.  The Russian Imperial family was killed by Bolsheviks in Ekaterinburg, Russia, on July 17, 1918.  After the reported murders, a number of people claimed to be surviving members of the family.
Suzanna Catharina de Graaff Anna Anderson