"Grant, of special grace, to Giles de Bello Campo, and his heirs, of free warren in all their demense lands of Alcestre, co. Warwick; with further grant that they may fortify the house (mansum) of their manor of Alecestre with a wall of stone and mortar and crenellate it and so hold it without impediment of the king and his ministers."
Granted at Westminster, by privy seal.
Original source is
(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;
More details about licences to crenellate can be found here.
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