Douglas Richardson's books give a death date of 19-25 March 1368 for the John de Eure who was born in 1302: "Magna Carta Ancestry", 2nd edition, Vol. II, p. 125 and ”Royal Ancestry", Vol. II, p. 524. Joseph Foster's book of the 1584/5 and 1612
Yorkshire visitations (with additions) gives a death date of Saturday in the 4th week of Lent (19 March) in 1367/8 - Joseph Foster, ''The Visitation of Yorkshire made in the years 1584/5... to which is added the subsequent Visitation made in 1612, with
several additional pedigrees'', privately printed 1875, pp. 610-612,
https://archive.org/details/McGillLibrary-hssl_visitation-yorkshire_CS437Y4A2-19990/page/n633/mode/2up Internet Archive. If 1367/8 is the regnal year, that would mean 1367.
In the Close Rolls is an order, dated 26 October 1367, to John de Scotherskelf escheator in Yorkshire and Northumberland "not to meddle further with the manor of Stokeslay and other lands taken into the king's hand by the death of John de Eure knight,
delivering to Robert his son any issues thereof taken" - ''Calendar of the Close Rolls, Edward III, Vol. XII, A.D. 1364-1368'', HMSO, 1910, p. 354,
https://archive.org/details/abd4709.0012.001.umich.edu/page/354/mode/2up?q=eure Internet Archive
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