In 1336 March 19, Johannes Dauneye, miles (John Dawney) was granted, by Edward III, (In year 10 of his reign) a Royal licence to crenellate Shevyok (Sheviock Barton)

"Licence for John Daimey, knight, to crenellate his dwelling-place (mansum) of Shevyok, co. Cornwall."

Granted at Westminster, by privy seal.

Sheviock Barton House is C16/C17 rubble-built house with hipped slate roofs and brick and plastered stacks. It is alleged that it stands on the site the manor house of John Dawney licensed in 1336. Area susceptible to French raids so may well have been acted upon. Kempthorne mentions a possible alternative site for this at the site of a medieval dovecote at SX36345413.

Original source is

• Calendar of Patent Rolls (1334-38) p238

(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;

• Emery, Anthony, 2006, Greater Medieval Houses Vol3 (Cambridge) p695
  Turner, T.H. and Parker, J.H., 1859, Some account of Domestic Architecture in England (Oxford) Vol3 pt2 p411

More details about licences to crenellate can be found here.

Please let me know if you see any errors, can add information or can otherwise help to improve this resource. Contact me