"Grant to the dean and chapter of the church of St. Mary, Lincoln, after recitation of the licence granted by Edward I for enclosing the precincts of the cathedral with a wall of the height of twelve feet, and of a former grant by the king to the said dean and chapter to the like effect, that they may raise the wall surrounding the said precincts beyond the height of twelve feet, and build turrets and crenellate the wall so raised and the turrets."
Granted at York, by King.
The Dean and Chapter received licenses to crenellate the Cathedral. The first for a 12 foot wall (issued 1285 and repeated 1316) the second to raise the wall and add turrets (issued 1318).
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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