When describing John as 2nd Lord or Baron FitzWalter, it needs to be remembered that these designations are specifically to the "Parliamentary" Barons Fitzwalter. Of course John had was not the second lord or baron in his family line, but he was the second to be summoned to parliament as "Lord FitzWalter". See Complete Peerage.
↑The Register of Henry Chichele, Archbishop of Canterbury 1414-1443
Collins, Arthur, and Egerton Brydges. "Percy, Duke of Northumberland." Collins's Peerage of England Genealogical, Biographical, and Historical. Vol. II. London: Printed for F.C. and J. Rivington, Otridge and Son ... [et Al., 1812. 217-366. Print.
Book: E. F. Jacob, 1938, The Register of Henry Chichele, Archbishop of Canterbury 1414-1443, Volume II, (Oxford: Clarendon Press), page 686.
Douglas Richardson, Plantagenet Ancestry: A study in Colonial and Medieval Families, (Baltimore, Maryland, 21202: Genealogical Publishing Company, Inc., 2004), page 328. Cited by Mr. Marlyn Lewis, Our Royal, Titled, Noble, and Commoner Ancestors & Cousins, database online, Portland, Oregon.
Vol. 1, Page 5: John was 13 years old at the death of his father (1327) "...he was Ward of Henry de Percy's, but in the 9th of Edward III. by the Kings special Favour, his Homage was accepted, and Livery made to him... He was in the French wars in 1359, being one of those appointed to accompany Sir Walter Manny in that Skirmish at Barriers of Paris, the Duke of Normandy then lying in that City, and was then Knighted: He married Eleanor Daughter of Henry Lord Percy, his Guardian, was summoned to Parliament from the 15th to the 34th of Edward III. exclusive, and died upon Monday the Feast of St. Luke the Evangelist, Anno 1360, leaving Walter his Son and Heir 16 Years of Age"