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Bean, J.  (2005, May 26). Percy, Henry, first earl of Northumberland (1341–1408), magnate and rebel. Oxford Dictionary of National Biography. Retrieved 5 Apr. 2020, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-21932.