Grand Duchess Anastasia of Catonia

In the short story The Girl in the Train, Anastasia Sophia Alexandra Maria Helena Olga Elizabeth is the Grand Duchess of Catonia. She wanted to marry Lord Roland Gaigh but her uncle Prince Osric objected to the marriage as he wanted her to marry his son Prince Karl. Anastasia was on her way to the registry in a taxi to marry Lord Roland when her uncle spotted her and started to follow her. Fortunately, her sister-in-law-to-be Elizabeth Gaigh was with her. She suggested that they switch coats and hats to trick Osric. This ruse worked. Osric followed Elizabeth to Waterloo Station, leaving Anastasia free to marry Lord Roland.

In the episode The Girl in the Train of The Agatha Christie Hour, a TV film adaptation of the story, the Grand Duchess is frequently mentioned but, as in the story, is not seen. There her name was changed to Grand Duchess Alexa of Catonia.