In 1230 Nov 28, H. de Burgo, comiti Kancie et Margarete uxori sue (Hubert de Burgh, Earl of Kent, and Margaret his wife) was granted, by Henry III, (In year 15 of his reign) a Royal licence to crenellate Hatheleg; Hadleg (Hadleigh Castle)

"Pro H. de Bunjo dc castro constntendo. — Rex omnibus ad quos presentes litere pervenerint, salutem. Sciatis quod concessimus pro nobis et heredibus nostris dilecto et fideli nostro H. de Burgo comiti Kancie, justiciario nostro Anglie, et Margarete uxori sue, quod construant ad volimtatem suam sibi et heredibus suis sine omni contradictione et difficultate castrum quoddam apud Hatheleg, quod est de honore de Relegh. In cujus rei testimoniuni, has literas nostras patentes eidem comiti fieri fecimus. Teste ut supra.
(Cancelled.) 'Inferius.'
Pro H. de Burgo de qnodam castro construendo. — Rex omnibus ad quos presentes litere pervenerint, salutem. Sciatis quod concessimus pro nobis et heredibus nostris H. de Burgo comiti Kancie, justiciario nostro Anglie, et Margarete uxori sue, quod construant pro voluntate sua sibi et heredibus suis de eisdem H. et M. descendentibus vel aliis heredibus ipsius H., si de heredibus eorundem H. et M. de eisdem H. et M. descendentibus humanitus contigerit, sine omni contradictione et difficultate castrum quoddam apud Hadleg, quod est de honore de Reyleg, quem honorem eisdem prius dedimus et per cartam nostram confirmavimus. In cujus etc. Teste rege, apud Westmonasterium, xxviij die Novembris."

Granted at Westminster, by King.

Original source is

• Calendar of Patent Rolls (1225-32) p417, 422

(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.)

Significant later source are;

• King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol1 p149n6

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

Burgh, Hubert de, earl of Kent (c.1170–1243), justiciar. 'Hubert de Burgh's career clearly shows the great rewards faithful royal service could bring to a man of minor landholding origins, and ‘loyal’ or ‘constant’ have been words applied to him by scholars. What is remarkable is that his loyal service did not make him unacceptable to the baronial opposition to John, and that he was able to serve Henry III within the limits set to royal government by Magna Carta' (West)

Biographical source include;

• F. J. West, ‘Burgh, Hubert de, earl of Kent (c.1170–1243)’, Oxford Dictionary of National Biography, Oxford University Press, Sept 2004; online edn, May 2007 [http://www.oxforddnb.com/view/article/3991, accessed 19 Nov 2007]
  

More details about licences to crenellate can be found here.

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