Archives in Seymour Papers, Longleat House, Wiltshire: "Patent to (Edward Seymour, 1st Duke of Somerset), to bear the coat of augmentation granted to Queen Jane Seymour, 10 August 1547. Box I.10.f.119"[1]
Burke, Bernard (1884). The General Armory of England, Scotland, Ireland, and Wales; Comprising a Registry of Armorial Bearings from the Earliest to the Present Time. London: Harrison & sons. p. 914.
Debrett, John (1836). Debrett's Complete Peerage of Great Britain, the United Kingdom and Ireland. London: J. G. & F. Rivington. p. 159.
Some sources state that the augmented arms were also granted at the time of Jane Seymour's marriage, to her eldest brother Edward Seymour, who was at that time created
Viscount Beauchamp, (later Earl of Hertford and Duke of Somerset) (MacCulloch, Diarmaid. (2018). Thomas Cromwell: A Life. London: Allen Lane. ISBN9780141967660, pp. 427-8, plate 9)
Coat of arms of Edward Seymour, Viscount Beauchamp, 1536
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