In 1399 April 2, Willielmus de Stirkeland (William Strickland) was granted, by Richard II, (In year 22 of his reign) a Royal licence to crenellate Penreth (Penrith Castle)

"Licence for William de Stirkeland, to whom the king lately granted licence to crenellate with stone and lime a chamber in Penreth upon the March of Scotland, to make a mantlet of stone and lime, join it to the said chamber and crenellate the same and so hold it for ever, in aid and succour of the said town and adjacent country.
The roll recites the previous grant thus: "nuper," &c., "concessimus," &c., "licentiam," &c., "kernellandi quandam cameram in villa de Penreth March. Scociae. Nos de uberiori gratia nostra concessimus" &c., "licentiam quod ipse unum mantelettum de petra et calce facere et camerae prasdictae conjungere et mantelettum praedictam kernellare," &c."

Granted at Westminster, by privy seal.

In 1397 William Strickland obtained a licence to strengthen and crenellate his pele tower. Two years later a further licence was granted to build a barmkin.
William Strickland (d. 1419), long civil and legal service to the bishop of Carlisle and to the Percys and Cliffords became Bishop of Carlisle himself in 1399, although some difficulties in the process meant he was not actually consecrated until 1400. Here the repeat is probably part of honouring the new bishop although there was also new building.

Original source is

• Calendar of Patent Rolls (1396-99) p524

(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, 1996, Greater Medieval Houses Vol1 (Cambridge) p263
  King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol1 p99n57
  Turner, T.H. and Parker, J.H., 1859, Some account of Domestic Architecture in England (Oxford) Vol3 pt2 p420

William Strickland (d. 1419)

William Strickland (d. 1419), long civil and legal service to the bishop of Carlisle and to the Percys and Cliffords became Bishop of Carlisle himself in 1399.

Biographical source include;

• Henry Summerson, ‘Strickland, William (d. 1419)’, Oxford Dictionary of National Biography, Oxford University Press, Sept 2004; online edn, Jan 2008 [http://www.oxforddnb.com/view/article/26670, accessed 1 Feb 2008]

More details about licences to crenellate can be found here.

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