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Susanna Annesley, "The Countess and the Constable: An exploration of the conflict that arose between Margaret de Burgh and Bertram de Criel", Henry III Fine Rolls Project, 2015: The National Archives and King's College London, http://www.finerollshenry3.org.uk/content/month/fm-07-2008.html, retrieved 21 December 2015, citing (Calendar of Charter Rolls 1226-57, p. 13).