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^E. Foss, The Judges of England, Vol. III: 1272-1377 (Longman, Brown, Green, and Longmans, London 1851), pp. 451-53 (Google).
^J. Campbell, The Lives of the Lord Chancellors and Keepers of the Great Seal of England Series I (3 vols) (John Murray, London 1845), I, pp. 264-68 (Google).