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Richardson, Douglas (2013). Royal Ancestry. Kimball G. Everingham, editor. Cf. V...
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Richardson, Douglas (2013). Royal Ancestry. Kimball G. Everingham, editor. Cf. Vol. V, p. 200 et seq. John Beaufort, K.G., 1st Earl of Somerset, married Margaret Holland (desc. King William the Conqueror) (see Somerset 11); and Vol. I p. 498; Vol. III p. 498 and 504; Vol. IV p. 645-650.