Research Notes:
Lincolnshire Pedigrees states that William de Barnardiston and his brother Simon lived in the time of Henry III (1216-1272). [1]
[1] Canon A. R. Madison, ed., Arthur Staunton Larken, Lincolnshire Pedigrees, Vol. 1 (London: Harleian Society, Vol. L, 1902), 90, pedigree of Barnardiston of Great Cotes, Lincoln; Kedington or Ketton, Suffolk; and of Ryes Lodge, Essex, [GoogleBooks].