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Bolton, B.  (2004, September 23). Guala [Guala Bicchieri] (c. 1150–1227), papal official. Oxford Dictionary of National Biography. Retrieved 7 Apr. 2020, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-50349.