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In page Swindon:

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The Anglo-Saxon settlement of Swindon sat in a defensible position atop a limestone hill. It is referred to in the 1086 Domesday Book as Suindune,[1] believed to be derived from the Old English words "swine" and "dun" meaning "pig hill" or possibly Sweyn's hill, Sweyn being a Scandinavian name akin to Sven and English swain, meaning a young man.[citation needed]