Granted at Westminster. Grant by King.

Original source is;

• Lyte, H.C. Maxwell (ed), 1903, Calendar of Patent Rolls (1225-32) p. 417 online copy, 422 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;

• King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol. 1 p. 149n6

Burgh, Hubert de, earl of Kent (c.1170–1243)

Biographical source include;

• F. J. West, Sept 2004, ‘Burgh, Hubert de, earl of Kent (c.1170–1243)’ Oxford Dictionary of National Biography (Oxford University Press) online edn, May 2007 online copy (subscription may be needed)