For Domesday see for example: Foster and Longley (1910) "Lincolnshire Domesday a...

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For Domesday see for example: Foster and Longley (1910) "Lincolnshire Domesday and the Lindsey Survey" The Publications - Lincoln Record Society 19 link J.J.N Palmer & George Slater, Open Domesday: The first free online copy of Domesday Book, 'Kolsveinn (of Lincoln)', https://opendomesday.org/name/321850/kolsveinn-of-lincoln/ : viewed 28 December 2017. PASE (Prosopography of Anglo-Saxon England),Colswein 12 "Colswein ‘of Lincoln’ (Lincs.), fl. 1086"

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