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In page Bathsua Makin:

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Her sister Ithamaria married the mathematician John Pell in 1632.[1] Makin corresponded with Pell. Manuscripts in the British Library reveal letters from Bathsua signed "your loving sister", along with letters written by Pell in which he refers to Bathsua as "sister".[citation needed] Thus, Makin has been wrongly identified as Pell's sister.[1]