Granted at Westminster. Grant by privy seal.

Original source is;

• Lyte, H.C. Maxwell (ed), 1907, Calendar of Patent Rolls (1350-54) p. 495 online copy

(In fact, the original source given is usually a transcription/translation of what are precious medieval documents not readily availably. It should be noted that these transcription/translations often date to the nineteenth or early twentieth centuries and that unwitting bias of transcribers may affect the translation. Care should also be taken to avoid giving modern meaning to the medieval use of certain stock words and terms. Licentia is best translated as 'freedom to' not 'permission'.)

Significant later sources are;

• Emery, Anthony, 1996, Greater Medieval Houses Vol. 1 (Cambridge) p. 263
  King, D.J.C., 1983, Castellarium Anglicanum Vol. 1 (London: Kraus) p. 99n35
  Wilson, J. (ed), 1905, VCH Cumberland Vol. 2 p. 256n2 online copy
  Turner, T.H. and Parker, J.H., 1859, Some account of Domestic Architecture in England (Oxford) Vol. 3 part 2 p. 415 online copy

William Greystoke, second Lord Greystoke (1321–1359)

Biographical source include;

• Keith Dockray, 2004, ‘Greystoke family (per. 1321–1487)’ Oxford Dictionary of National Biography (Oxford University Press) online copy (subscription may be needed)