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Capp, B.  (2004, September 23). Heydon, Sir Christopher (1561–1623), soldier and writer on astrology. Oxford Dictionary of National Biography.  Retrieved 22 May. 2019, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-13166.