In 1372 Nov 26, Cives et probi homines civitatis was granted, by Edward III, (In year 46 of his reign) a Royal licence to crenellate Novae Sarum (Salisbury City Defences)

"civitatem"

Granted at Westminster, by privy seal.

Licence to crenellate granted 1372, ratified in 1377, may have resulted in bank and palisade. Also granted licence in 1328.

Original source is

• Calendar of Patent Rolls (1370-74) p220

(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;

• Turner, T.H. and Parker, J.H., 1859, Some account of Domestic Architecture in England (Oxford) Vol3 pt2 p328, 417

More details about licences to crenellate can be found here.

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