Ulstin is Feyre's mother's cousin mentioned in A Court of Thrones and Roses and A Court of Silver Flames. She died of malaria contracted in Bharat according to Feyre, though Nesta believes that she is still alive on The Continent, unaware of what has happened to her cousin, her husband, and daughters. It is mentioned that she ignored letters sent from Nesta, which were unanswered.

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