The comprehensive gazetteer and bibliography of the medieval castles, fortifications and palaces of England, Wales, the Islands.
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In 1335 Jan 30, Ranulphus de Blankmouster (Blank Monsly; Blanchminster; Blaundmuster; Blancmuster; Baundmister) was granted, by Edward III, (In year 9 of his reign) a Royal licence to crenellate Biename (Binhamy)
Licence for Runulph de Blankmonster to crenellate his dwelling-place of Biename, co. Cornwall. By p.s. (CPR)

Ranulphus de Blankmouster ... mansum ... Biename, Cornub. (Turner and Parker)

Granted at Roxburgh. Grant 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. Licentia is best translated as 'freedom to' not 'permission'.)

Significant later sources are;

Sir Ralph de Blanchminster (d. 1348)
Sir Ralph, lived to a considerable age and held an important place in the county. In 1314 he was returned as Memeber for the county, and in the same year he was summoned to the muster at Newcastle-o-Tyne to perform military service against the Scots. The Blanchminsters had also acquired the lordship of Scilly, possibly through the first Sir Ralph's marriage with his wife Isabella. (Bone)

A Ranulph de Blankmouster was granted 'freewarren in all his demesne lands of Wyghale (Wighill) and Calueton' in Yorkshire in 1306, although this may not be the same person.

Biographical source include;

More information about licences to crenellate can be found here.

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Record created by Philip Davis. This record last updated on Sunday, October 4, 2015.