In medieval England and Wales a licence to crenellate granted the holder permission to fortify their property. Such licences were granted by the king, and by the rulers of the
counties palatine within their jurisdictions, e.g. by the
Bishops of Durham and the
Earls of Chester and after 1351 by the
Dukes of Lancaster. The castles in England vastly outnumbered the licences to crenellate. Royal pardons were obtainable on the payment of an arbitrarily-determined fine by a person who had fortified without licence. The surviving records of such licences, generally issued by
letters patent, provide valuable evidence for the dating of ancient buildings. A list of licences issued by the English Crown between the 12th and the 16th centuries was compiled by Turner & Parker and expanded and corrected by Philip Davis and published in
The Castle Studies Group Journal. There has been academic debate over the purpose of licensing. The view of military-focused historians is that licensing restricted the number of fortifications that could be used against a royal army. The modern view, proposed notably by Charles Coulson, is that battlements became an architectural status-symbol much sought after by the socially ambitious, in Coulson's words: "Licences to crenellate were mainly symbolic representations of lordly status: castellation was the architectural expression of noble rank". They indicated to the observer that the grantee had obtained "royal recognition, acknowledgment and compliment". They could, however, provide a basic deterrent against wandering bands of thieves, and it is suggested that the function of battlements was comparable to the modern practice of householders fitting highly visible
CC TV and burglar alarms, often merely dummies. The crown usually did not charge for the granting of such licences, but occasionally charged a fee of about half a
mark. ==Machicolations==