She was the daughter of Hugh de Courtenay, 1st Earl of Devon and Agnes de St. John.[1][2][3]
Sources
↑ Ezra Cleaveland. A Genealogical History of the Noble and Illustrious Family of Courtenay, (Exon: E. Farley, 1735), p. 150.
↑ G E Cokayne. The Complete Peerage, revised edition, Vol. IV, St Catherine Press, 1916, p. 324.
↑ J L Vivian (ed.). The Visitations of Cornwall, comprising the Heralds' Visitations of 1530, 1573 and 1620, William Pollard, 1887, p. 106, UK Genealogy Archives, accessed 23 April 2020
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