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Stell, G.  (2004, September 23). Balliol, Dervorguilla de, lady of Galloway (d. 1290), noblewoman and benefactor. Oxford Dictionary of National Biography. Retrieved 12 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-49378.