In 1296 Sept 5, Prior et Conventus de Tynemuth (prior and convent) was granted, by Edward I, (In year 24 of his reign) a Royal licence to crenellate Tynemuth (Tynemouth Priory)

"Prioratum suum de Tynemuthe"

Granted at Berwick-on-Tweed,

Original source is

• Calendar of Patent Rolls (1292-1301) p197

(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;

• Brooke, C.J., 2000, Safe Sanctuaries (Edinburgh; John Donald) p170
  King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol2 p372n271
  Coulson, C., 1982, 'Hierarchism in Conventual Crenellation' Medieval Archaeology Vol26 p93
  Bates, C.J., 1891, Border Holds of Northumberland (London and Newcastle: Andrew Reid) p8
  Turner, T.H. and Parker, J.H., 1859, Some account of Domestic Architecture in England (Oxford) Vol3 pt2 p404

More details about licences to crenellate can be found here.

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