question: Who is the paternal grandfather of Eleanor De Bohun?
context: [["Henry de Bohun", ["Sir Henry de Bohun( died 23 June 1314) was an English knight, the grandson of Humphrey de Bohun, 2nd Earl of Hereford.", "He was killed on the first day of the Battle of Bannockburn by Robert the Bruce.", "Riding in the vanguard of heavy cavalry, de Bohun caught sight of the Scottish king who was mounted on a small palfrey\"( ane gay palfray Li till and joly)\" armed only with a battle- axe.", "De Bohun lowered his lance and charged, but Bruce stood his ground.", "At the last moment Bruce manoeuvred his mount nimbly to one side, stood up in his stirrups and hit de Bohun so hard with his axe that he split his helmet and head in two.", "Despite the great risk the King had taken, he merely expressed regret that he had broken the shaft of his favourite axe.", "An iconic description and picture of the death of Henry de Bohun is contained in\" Scotland's Story\" by H. E. Marshall."]], ["John de Ferrers, 1st Baron Ferrers of Chartley", ["John de Ferrers, 1st Baron Ferrers of Chartley( 1271, Cardiff \u2013 1312) was the son of Robert de Ferrers, 6th Earl of Derby and Alianore de Bohun, daughter of Humphrey de Bohun and Eleanor de Braose, and granddaughter of Humphrey de Bohun, 2nd Earl of Hereford.", "He was both Seneschal of Gascony and Lieutenant of Aquitaine in 1312, the year of his death.", "He married Hawise de Muscegros, a daughter of Robert de Muscegros.", "Their son Robert de Ferrers inherited the title Baron Ferrers of Chartley upon his father's death from poisoning in Gascony in 1312."]], ["Henry Krause", ["Henry J.\" Red\" Krause, Jr.( August 28, 1913 \u2013 February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.", "He played college football at St. Louis University.", "He is the grandfather of Jennifer Krause", "He is the great grandfather of Payton Hoeing"]], ["Kaya Alp", ["Kaya Alp was, according to Ottoman tradition, the son of K\u0131z\u0131l Bu\u011fa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertu\u011frul, and the great grandfather of the Ottoman Empire founder, Osman I."]], ["Anne of Gloucester", ["Anne of Gloucester, Countess of Stafford (30 April 1383 \u2013 16 October 1438) was the eldest daughter of Thomas of Woodstock, Duke of Gloucester, and Eleanor de Bohun."]], ["Humphrey de Bohun, 7th Earl of Hereford", ["Humphrey de Bohun, 7th Earl of Hereford, 6th Earl of Essex,", "2nd Earl of Northampton, KG (25 March 1341 \u2013 16 January 1373) was the son of William de Bohun, 1st Earl of Northampton and Elizabeth de Badlesmere, and grandson of Humphrey de Bohun, 4th Earl of Hereford by Elizabeth of Rhuddlan, daughter of King Edward I.", "He became heir to the Earldom of Hereford after the death of his childless uncle Humphrey de Bohun, 6th Earl of Hereford.", "Following King Peter", "I's visit to England", ", Humphrey participated in the sack of Alexandria in 1365.", "His wife and the mother of his daughters was Joan Fitzalan, daughter of Richard Fitzalan, 10th Earl of Arundel and Eleanor of Lancaster, whom he married after 9 September 1359.", "On his death, his great estates were divided between his two surviving daughters:"]], ["Eleanor de Bohun", ["Lady Eleanor de Bohun (\u2013 3 October 1399) was the elder daughter and co-heiress with her sister, Mary de Bohun, of their father Humphrey de Bohun, 7th Earl of Hereford (1341\u20131373).", "Her mother was Lady Joan Fitzalan, daughter of Richard FitzAlan, 10th Earl of Arundel and his second wife Eleanor of Lancaster."]], ["Humphrey de Bohun, 2nd Earl of Hereford", ["Humphrey( IV) de Bohun( 1204 \u2013 24 September 1275) was 2nd Earl of Hereford and 1st Earl of Essex, as well as Constable of England.", "He was the son of Henry de Bohun, 1st Earl of Hereford, and Maud FitzGeoffrey."]], ["Aimery I, Viscount of Ch\u00e2tellerault", ["Aimery I de Ch\u00e2tellerault( \u2013 7 November 1151), was the Viscount of Ch\u00e2tellerault and father of Aenor de Ch\u00e2tellerault.", "Through his daughter he was the grandfather of Eleanor of Aquitaine, successively queen of France and England."]], ["Eleanor de Braose", ["Eleanor de Braose( c. 1228\u20131251) was a Cambro- Norman noblewoman in Great Britain, and a wealthy co-heiress of her father, who was the powerful Marcher lord William de Braose, and of her mother, Eva Marshal, a co-heiress of the Earls of Pembroke.", "Her husband was Humphrey de Bohun, heir of the 2nd Earl of Hereford, by whom she had children, including Humphrey de Bohun, 3rd Earl of Hereford."]]]
supporting_facts: [["Eleanor de Bohun", 0], ["Humphrey de Bohun, 7th Earl of Hereford", 1]]
evidences: [["Eleanor de Bohun", "father", "Humphrey de Bohun, 7th Earl of Hereford"], ["Humphrey de Bohun, 7th Earl of Hereford", "father", "William de Bohun, 1st Earl of Northampton"]]
answer: William de Bohun, 1st Earl of Northampton