The Mary and Eliza Chulkhurst reference article from the English Wikipedia on 24-Apr-2004
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Mary and Eliza Chulkhurst

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Mary and Eliza Chulkhurst (1100-1134) (also known as the Biddenden Maids) are the earliest known set of conjoined twins. They were joined at the hip, although illustrations also depict them joined at the shoulder. Mary and Eliza were born in 1100 in Biddenden, Kent, England and died in 1134. They left their entire estate to the church.