House of Beaufort
Noble family
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The House of Beaufort is an English noble and quasi-royal family which originated in the fourteenth century as the legitimated issue of John of Gaunt, 1st Duke of Lancaster by Katherine de Roet. Wikipedia
Cadet branches: House of Tudor(from Henry_VII through a female line onward); Somerset family
Founder: John Beaufort, 1st Earl of Somerset
Parent house: House of Lancaster (legitimated)