Beaufort, John, marquess of Dorset and marquess of Somerset (c. 1371–1410), soldier and administrator, was the first offspring of the liaison between John of Gaunt, duke of Lancaster (1340–1399), and Katherine Swynford (1350?–1403) [see Katherine, duchess of Lancaster]. He became a staunch supporter of ...
G. L. Harriss
Plantagenet, Arthur, Viscount Lisle (b. before 1472, d. 1542), soldier, diplomat, and administrator, was the illegitimate son of Edward IV (1442–1483).
The identity of Arthur's mother and his date of birth have given rise to much speculation. The editor of his correspondence, Muriel St Clare Byrne...