question: Who is the maternal grandmother of Isabel De Verdun, Baroness Ferrers Of Groby?
context: [["Hubba bint Hulail", ["Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic\" Nab\u012b\"( Prophet) Muhammad ibn Abdullah."]], ["Isabel de Verdun, Baroness Ferrers of Groby", ["Isabel de Verdun, Baroness Ferrers of Groby (21 March 1317 \u2013 25 July 1349) was an heiress, who was related to the English royal family as the eldest daughter of Elizabeth de Clare, herself a granddaughter of King Edward I of England.", "When she was a child, Isabel was imprisoned in Barking Abbey, along with her mother and half-sister, after her stepfather had joined the Earl of Lancaster's ill-fated rebellion against King Edward II.", "Her husband was Henry Ferrers, 2nd Baron Ferrers of Groby."]], ["Elizabeth de Clare", ["Elizabeth de Clare, 11th Lady of Clare (16 September 1295 \u2013 4 November 1360) was the heiress to the lordships of Clare, Suffolk, in England and Usk in Wales.", "She was the youngest of the three daughters of Gilbert de Clare, 6th Earl of Hertford and Joan of Acre, and sister of Gilbert de Clare, who later succeeded as the 7th Earl.", "She is often referred to as Elizabeth de Burgh, due to her first marriage to John de Burgh.", "Her two successive husbands were Theobald II de Verdun (of the Butler family) and Roger d'Amory."]], ["John Bourchier, 6th Baron Ferrers of Groby", ["Sir John Bourchier( 1438 \u2013 1495) was a 15th- century English knight and nobleman.", "He was steward of the Honour of Richmond.", "Bourchier fought in the Battle of Bosworth in 1485 on the side of King Richard III.", "Bourchier was the fourth son of Henry Bourchier, 1st Earl of Essex and his wife Isabel of Cambridge, Countess of Essex.", "Before 2 May 1462, Bourchier married to the heiress Lady Elizabeth Grey, widow of Sir Edward Grey,\" jure uxoris\" 6th Baron Ferrers of Groby( d. 18 December 1457).", "Lady Elizabeth was the granddaughter and heiress of William Ferrers, 5th Baron Ferrers of Groby in her own right.", "When Lady Ferrers remarried to Bourchier, he received the title of Baron Ferrers of Groby(\" jure uxoris\").", "They had no issue.", "After the death of Lady Ferrers, Bourchier remarried to Elizabeth Chichele before 6 July 1490.", "Bourchier left a will dated 4 June 1495 in which he requested his burial in Bilegh Abbey, Essex, next to the tomb of his parents.", "According to some sources Bourchier died in Spain."]], ["Robert de Ferrers, 4th Baron Ferrers of Chartley", ["Robert de Ferrers, 4th Baron Ferrers of Chartley( 1358 \u2013 1413) was the son of John de Ferrers, 3rd Baron Ferrers of Chartley and Elizabeth de Stafford, a daughter of Ralph de Stafford, 1st Earl of Stafford and Margaret de Audley.", "He inherited the title of Baron Ferrers of Chartley upon his father's death at the Battle of N\u00e1jera on 3 April 1367 but was never summoned to parliament.", "Robert married Margaret Le Despenser( born around 1360) a daughter of Edward le Despencer, 1st Baron le Despencer, KG, and Lady Elizabeth Burghersh.", "The couple had one son Edmund, who became Edmund de Ferrers, 5th Baron Ferrers of Chartley upon the death of his father around 1412, and one daughter Philippe, who married Sir Thomas Greene, Sheriff of Northamptonshire( 10 February 1399 \u2013 18 January 1462), by whom she was the grandmother of Sir Thomas Green.", "Philippe and Sir Thomas are ancestors to Queen consort Catherine Parr, the last wife of King Henry VIII.", "Robert de Ferrers, 4th Baron Ferrers of Chartley died sometime around 1413 and is buried at Merevale Abbey in Warwickshire."]], ["Hannah Arnold", ["Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children."]], ["Henry de Verdun (I)", ["Sir Henry de Verdun( I) was recorded as being a Knight of Staffordshire in 1227 and 1228( with his brother Milo de Verdun), and Sheriff of Staffordshire and Coroner there in 1228, seemingly in succession to Henry de Deneston.", "Henry was the son of Bertram de Verdun( III) of Alton Castle, Staffordshire.", "He married Hawise, daughter of Engenulf de Gresley.", "He held the manor of Bucknall from his older brother Nicholas de Verdun of Alton, and gained other manors and lands through his marriage to Hawise, including Darlaston, Biddulph, Swadlincote, Thursfield and Levedale.", "His heir was his son Henry de Verdun( II), who married Amice, daughter of Sir Roger de Pyvelesdon( died 1272 and commemorated by the Puleston Cross in Newport, Shropshire), sister of Jordan de Pyvelesdon, Roger de Pyvelesdon( died 1294), and Alice de Pyvelesdon who married Sir Robert de Harley, lord of Harley in Shropshire."]], ["William Ferrers, 3rd Baron Ferrers of Groby", ["William Ferrers, 3rd Baron Ferrers of Groby( 1333 \u2013 1371) was a Leicestershire- based nobleman in fourteenth- century England who took part in some of the major campaigns of the first part of the Hundred Years' War.", "The eldest of two sons to Henry Ferrers, 2nd Baron Ferrers of Groby( d. 1343), he was ten years old when he succeeded his father to the Barony."]], ["Matilda of Saxony, countess of Flanders", ["Matilda of Saxony( c. 935-942 \u2013 25 May 1008) was duchess of Saxony, countess of Saxony, princess of Saxony, and countess of Flanders.", "She was the daughter of Hermann Billung and Hildegard von Westerburg.", "She was born in Herzogtum Sachsen, Ostenfrankenreich, now part of modern Germany.", "Matlida was the sister of Swanhilde of Saxony and Bernard I, duke of Saxony; and half sister of Liudger von Sachsen, Graf von Lesum und Westfalen and Imma Von Billung, Abbess of Hereford.", "Matilda was the wife of Baldwin III, count of Flanders, with whom she had a son Arnulf II the Young, count of Flanders.", "After Baldwin's death, Matilda married Godefroi", "I the Captive, count of Ardennes, with whom she had eleven children: Adelaide d' Ardennes, Duchess of Lorraine; Comte van Verdun Godefroy Herzog von Niederlothringen, II; Gerberge de Verdun, comtesse; Hermann, comte de Verdun et d'Enham; Gothelo I\" the Great\", duke of Lorraine; Irmgard, comtesse de Verdun; Roger de Verdun, Governor of Ambriences Castle; Fr\u00e9d\u00e9ric de Verdun; Regilla de Verdun; comte Adalberto Ev\u00eaque de Vermandois, II and Ermentrude von Lothringen de Verdun.", "Matilda died on 25 May 1008 and was buried in Ghent, East Flanders, Belgium."]], ["Charlotte Townshend, Viscountess Townshend", ["Charlotte Townshend, Viscountess Townshend( died 3 September 1770),\" suo jure\" 15th Baroness Ferrers of Chartley and 7th Baroness Compton, known as Lady Charlotte Compton until 1749 and as Lady Ferrers of Chartley from 1749 to 1764, was a British peeress.", "Charlotte was the only surviving child of James Compton, 5th Earl of Northampton, and Elizabeth, 14th Baroness Ferrers of Chartley.", "The barony of Ferrers of Chartley had fallen into abeyance on her mother's death in 1741.", "However, in 1749 the abeyance was terminated in Charlotte's favour and she became the 15th Baroness.", "In 1754 she also succeeded her father in the barony of Compton.", "In 1751 Charlotte married the Hon. George Townshend, later fourth Viscount Townshend and first Marquess Townshend.", "When he succeeded in the viscountcy in 1764 she became known as the Viscountess Townshend.", "Charlotte died in September 1770 and was succeeded in the two baronies by her eldest son George, who was created Earl of Leicester in 1784 and later succeeded as second Marquess Townshend.", "Her husband survived her by over 30 years and died in 1807."]]]
supporting_facts: [["Isabel de Verdun, Baroness Ferrers of Groby", 0], ["Elizabeth de Clare", 1]]
evidences: [["Isabel de Verdun, Baroness Ferrers of Groby", "mother", "Elizabeth de Clare"], ["Elizabeth de Clare", "mother", "Joan of Acre"]]
answer: Joan of Acre