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Cramp, R.  (2004, September 23). Ælla (d. in or after 597?), king of Deira. Oxford Dictionary of National Biography. Retrieved 13 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-199.