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Joan Mowbray, who married firstly Sir Thomas Grey (1359 – 26 November or 3 December 1400) of Heaton near Norham, Northumberland, son of the chronicler Sir Thomas Grey, and secondly Sir Thomas Tunstall of Thurland in Tunstall, Lancashire.
Hugh de Grey (born Chillingham, Northumberland, c. 1203), father of John de Grey, born in Scotland, and grandfather of Thomas de Grey of Heton (Heton, Northumberland, circa 1266 - Angus, Scotland, 1310), whose son Sir Thomas de Grey of Heaton (circa 1297 - bef. 12 March 1343/1344) was taken prisoner by the Scots at Bannockburn and married circa 1327 Agnes (possibly Agnes de Beyle, born Heton, Northumberland, c. 1301), being the parents of Sir Thomas Grey
Documents note the existence in 1415 of a defensive tower at Nesbit belonging to Sir Thomas Grey.