question: Who is the maternal grandmother of Gian Galeazzo Visconti?
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."]], ["Gian Maria Visconti", ["Gian Maria Visconti( or Giovanni Maria; 7 September 1388 in Abbiategrasso \u2013 16 May 1412) was the second Visconti Duke of Milan, the son of Gian Galeazzo Visconti and Caterina Visconti."]], ["Estorre Visconti", ["Estorre Visconti, or Astorre according to other sources( 13467 January 1413), was one of the many illegitimate sons of the famous Bernab\u00f2 Visconti, Lord of Milan and already deposed by his nephew Gian Galeazzo Visconti in 1385."]], ["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."]], ["Gian Galeazzo Visconti", ["Gian Galeazzo Visconti (16 October 1351 \u2013 3 September 1402), son of Galeazzo II Visconti and Bianca of Savoy, was the first Duke of Milan (1395) and ruled the late-medieval city just before the dawn of the Renaissance.", "He was the founding patron of the Certosa di Pavia, completing the Visconti Castle at Pavia begun by his father and furthering work on the Duomo of Milan."]], ["John III, Count of Armagnac", ["John III of Armagnac (1359 \u2013 July 25, 1391) was a Count of Armagnac, of F\u00e9zensac and Rodez from 1384 to 1391.", "He was the son of John II of Armagnac, and Jeanne of P\u00e9rigord.", "In 1390, John claimed the kingdom of Majorca, but was overcome by the troops of Juan I of Aragon in a battle near Navata.", "John III consequently led military actions in Roussillon.", "In 1391, he had to leave for Italy in order to go to the assistance of Charles Visconti, Lord of Parma and husband of his sister, Beatrix of Armagnac.", "Visconti was in conflict with his acquisitive cousin Gian Galeazzo Visconti, later the duke of Milan, whose ambition was to control the whole of northern Italy.", "His army was attacked and decisively beaten by that of Gian Galeazzo Visconti as it passed through Alessandria in Piedmont.", "John III was killed in the battle."]], ["Isabella, Countess of Vertus", ["Isabella of France (1 October 1348 \u2013 11 September 1373) was a French princess and member of the House of Valois, as well as the wife of Gian Galeazzo Visconti, who after her death became Duke of Milan.", "Born in Bois de Vincennes, Isabella was the youngest daughter of King John II of France by his first wife, Bonne of Bohemia.", "Her maternal uncle Count Amadeus VI of Savoy arranged her marriage with Gian Galeazzo Visconti.", "As her dowry, Isabella received the county of Sommi\u00e8res, exchanged later for the county of Vertus.", "On 8 October 1360, Isabella and Gian Galeazzo were married in Milan, and six months later, in April 1361, she was declared sovereign Countess of Vertus.", "The couple had four children:\nIsabella died in childbirth in Pavia in 1373."]], ["Bianca of Savoy", ["Bianca of Savoy (1337\u2013 Pavia, 31 December 1387) was Lady of Milan by marriage to Galeazzo II Visconti.", "She was the only surviving daughter of Aimone, Count of Savoy and Yolande Palaeologina of Montferrat."]], ["Hannah Arnold", ["Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children."]], ["Mona Hopton Bell", ["Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.", "She was the grandmother of the painter Jean H. Bell."]]]
supporting_facts: [["Gian Galeazzo Visconti", 0], ["Bianca of Savoy", 1]]
evidences: [["Gian Galeazzo Visconti", "mother", "Bianca of Savoy"], ["Bianca of Savoy", "mother", "Yolande Palaeologina of Montferrat"]]
answer: Yolande Palaeologina of Montferrat