Matches in DBpedia 2014 for { ?s ?p John Beaufort, 1st Marquess of Somerset and 1st Marquess of Dorset, later only 1st Earl of Somerset, KG (1373 – 21 April 1410) was the first of the four illegitimate children of John of Gaunt, 1st Duke of Lancaster, and his mistress Katherine Swynford, later his wife.. }
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- John_Beaufort,_1st_Earl_of_Somerset comment "John Beaufort, 1st Marquess of Somerset and 1st Marquess of Dorset, later only 1st Earl of Somerset, KG (1373 – 21 April 1410) was the first of the four illegitimate children of John of Gaunt, 1st Duke of Lancaster, and his mistress Katherine Swynford, later his wife.".