The Gatehouse website record of a licence to crenellate for Edgefield Hall granted on 1334 May 18

Original source is;

Lyte, H.C. Maxwell (ed), 1895, Calendar of Patent Rolls (1334-38) p. 10 online copy

(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. Licentia is best translated as 'freedom to' not 'permission'.)

Significant later sources are;

Turner, T.H. and Parker, J.H., 1859, Some account of Domestic Architecture in England (Oxford) Vol. 3 part 2 p. 410 online copy

Thomas Rocelyn (1273-1336)

Thomas Roscelyn 'A Lancastrian knight, also a long-term adherent of Roger Mortimer; however, he grew so disillusioned and angry with his former ally that he rebelled against him in late 1328, and came to see the return of Edward II as preferable to Mortimer's misrule of England! In 1316, he attended the wedding of Mortimer's son Edmund, and on 12 August 1323 and 31 May 1325, was described as "a rebel" by Edward II, for taking part in the Marcher rebellion of 1321/22, led by Roger Mortimer. In early 1329, Thomas and Henry, Lord Beaumont, fled abroad after taking part in the earl of Lancaster's rebellion against Mortimer and Isabella.' (Kathryn, 2007)

He was killed in fighting against the Scots near Aberdeen in 1336 (Cokayne)

Thomas is described as a rebel in 1323, when his lands are granted to John Darcy for life (CPR 1321-24 p. 332). In 1330 he is granted protection and safe conduct for travel from beyond the sea to respond to a summons of the king (CPR 1330-34 p. 20). He was a leading rebel against the rule of Mortimer during Edward III minority and conspired with other for the restoration of Edward II, who many still believed to be alive and imprisoned by Mortimer.

Biographical source include;

Kathryn, 2007, Dec 10, 'The Conspiracy of the Earl of Kent, 1330' online blog
Cokayne, G.E., 2000, The Complete Peerage Vol. 12 p. 659

More information about licences to crenellate can be found here.

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