question: Who is the maternal grandmother of Joan, Countess Of Blois?
context: [["Tjuyu", ["Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.", "She is the grandmother of Akhenaten, and great grandmother of Tutankhamun."]], ["Margaret, Countess of Blois", ["Margaret of Blois( French:\" Marguerite\"; died 1230) was\" suo jure\" Countess of Blois from 1218 to 1230, in what is now France."]], ["Joan, Countess of Blois", ["Joan of Ch\u00e2tillon (\"Jeanne de Blois\"; 1253? \u2013 19 or 29 January 1291) was Countess of Blois from 1280 to 1291, and Lady of Avesnes.", "She was the daughter of John I, Count of Blois and Alix of Brittany, Dame de Pontarcy.", "Joan received the County of Chartres from her father during his life; she later sold these lands to Philip IV of France in 1286.", "She ceded the lordship of Avesnes to her cousin Hugh before her death.", "When she died in 1291 the other titles were left to him also.", "In 1263, Joanne married Peter of Alen\u00e7on, a son of King Louis IX of France and Margaret of Provence.", "They had two sons who both died in infancy:", "Joan died in 1291, with no living issue.", "She left the title of Count of Blois and her remaining titles to her cousin Hugh."]], ["Theobald II of Blois", ["Theobald II, Count of Blois( Thibaut II; c. 985 \u2013 11 July 1004) was the eldest son and heir of Odo I, Count of Blois, and Bertha of Burgundy.", "The stepson of Robert II of France, he became Count of Blois, Ch\u00e2teaudun, Chartres and Reims after the death of his father in 996.", "Theobald II left no heirs; on his death, he was succeeded by his younger brother, Odo II, Count of Blois."]], ["Alix of Brittany, Dame de Pontarcy", ["Alix of Brittany, Dame de Pontarcy, Countess of Blois (6 June 1243 \u2013 2 August 1288), was a Breton noblewoman and a member of the House of Dreux as the eldest daughter of John I, Duke of Brittany.", "She married John I, Count of Blois.", "Alix was known for founding religious houses including the Monastery of La Guiche, where she was later buried.", "Alix, named after her paternal grandmother, Alix of Thouars, was born on 6 June 1243 at the Ch\u00e2teau de Suscinio in Sarzeau, Morbihan, Brittany.", "She was the eldest daughter of John I, Duke of Brittany and Blanche of Navarre, daughter of Theobald I of Navarre and Agnes of Beaujeu.", "Alix held the title \"Dame de Pontarcy\" in her own right.", "Sometime after a contract was signed on 11 December 1254, she married John I, Count of Blois of the House of Ch\u00e2tillon.", "Thereafter she was styled Countess of Blois.", "She brought as her dowry her titles of Pontarcy and de Brie-Comte-Robert, which had been named after her ancestor Robert I of Dreux.", "The marriage produced one child, a daughter Jeanne, who was heiress to her father's title and estates.", "In 1270, her husband was appointed Lieutenant General of France.", "Through Alix's marriage to John, the Ch\u00e2teau de Brie-Comte-Robert passed to the Ch\u00e2tillon family.", "Alix and John founded several religious houses including the Monastery of La Guiche near Blois in 1277.", "She became a widow on 28 June 1279.", "In 1287, the year before her own death, Alix travelled to Palestine.", "From there she journeyed on to Syria, where she commissioned the erection of two barbican towers at Ptolemais."]], ["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."]], ["Theobald III, Count of Blois", ["Theobald III of Blois( French:\" Thibaut\")( 1012\u20131089) was count of Blois, Meaux and Troyes.", "He was son of Odo II, Count of Blois and Ermengarde of Auvergne."]], ["Alix of France", ["Alix of France( July \u2013 August 1150 \u2013 1197/1198) was countess consort of Blois by marriage to Theobald V, Count of Blois.", "She was regent of Blois during the absence of her spouse in 1190- 1191, and regent during the minority of Louis I, Count of Blois from 1191 until 1197."]], ["Mary, Countess of Blois", ["Mary, Countess of Blois, also known as\" Marie of Avesnes\",( 1200 \u2013 1241) was countess of Blois from 1230 to 1241.", "She was the daughter of Walter of Avesnes and Margaret of Blois.", "In 1226, Mary married Hugh I of Ch\u00e2tillon, a count from Ch\u00e2tillon- sur- Marne, son of Gaucher III of Ch\u00e2tillon and Elisabeth of Saint Pol.", "They had five children:", "Her eldest son John, succeeded her in Blois."]], ["Hannah Arnold", ["Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children."]]]
supporting_facts: [["Joan, Countess of Blois", 1], ["Alix of Brittany, Dame de Pontarcy", 4]]
evidences: [["Joan of Ch\u00e2tillon (\"Jeanne de Blois", "mother", "Alix of Brittany, Dame de Pontarcy"], ["Alix of Brittany, Dame de Pontarcy", "mother", "Blanche of Navarre"]]
answer: Blanche of Navarre