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The only source that explicitly names Joan's mother is her obit in the Tewkesbur...
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The only source that explicitly names Joan's mother is her obit in the Tewkesbury Annals: "Obiit domina Johanna domina Walliae, uxor Lewelini filia regis Johannis et regina Clemencie, iii. kal. Aprilis." See p 825, Dictionary of National Biography, Vol. X, Sir Leslie Stephen, Sir Sidney Lee Smith (Elder & Company, 1908)