"Licence for Thomas earl of Ormond to build walls and towers of stone, lime, sand and 'brike' round and within the manor of Newehall, co. Essex, and to crenellate and machicolate the same so to hold the same for ever, also to impark 1,000 acres of land, wood, meadow, pasture, heath and moor in the parishes of Boram, Springfelde, and Little Waltham, co. Essex; and to have free-warren for ever in the said manor."
Granted at Westminster, by privy seal.
Licence to crenellate granted to Thomas, earl of Ormonde in 1491 for the house then called Walkfares.
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.)
More details about licences to crenellate can be found here.
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