question: Who is Victoria Of France's maternal grandmother?
context: [["Catherine de' Medici", ["Catherine de' Medici (13 April 1519 \u2013 5 January 1589), was an Italian noblewoman who was queen consort of France from 1547 until 1559, by marriage to King Henry II, and Queen mother of kings Francis II, Charles IX and Henry III from 1559 to 1589.", "The years during which her sons reigned have been called \"the age of Catherine de' Medici\" as she had extensive, if at times varying, influence in the political life of France.", "She was born in Florence to Lorenzo de\u2019 Medici, Duke of Urbino and Madeleine de La Tour d'Auvergne.", "In 1533, at the age of fourteen, Catherine married Henry, second son of King Francis I and Queen Claude of France.", "Catherine's marriage was arranged by her uncle Pope Clement VII.", "Henry excluded Catherine from participating in state affairs and instead showered favors on his chief mistress, Diane de Poitiers, who wielded much influence over him.", "Henry's death thrust Catherine into the political arena as mother of the frail 15-year-old King Francis II.", "When he died in 1560, she became regent on behalf of her 10-year-old son King Charles IX and was granted sweeping powers.", "From 1560 to 1563, she ruled France as regent for her son Charles IX, King of France.", "After Charles died in 1574, Catherine played a key role in the reign of her third son, Henry III.", "He dispensed with her advice only in the last months of her life (he would outlive her by seven months).", "Catherine's three sons reigned in an age of almost constant civil and religious war in France.", "The problems facing the monarchy were complex and daunting but Catherine was able to keep the monarchy and the state institutions functioning even at a minimum level.", "At first, Catherine compromised and made concessions to the rebelling Calvinist Protestants, or Huguenots, as they became known.", "She failed, however, to grasp the theological issues that drove their movement.", "Later she resorted, in frustration and anger, to hard-line policies against them.", "In return, she came to be blamed for the excessive persecutions carried out under her sons' rule, in particular for the St. Bartholomew's Day massacre of 1572, in which thousands of Huguenots were killed in Paris and throughout France.", "Some historians have excused Catherine from blame for the worst decisions of the crown, though evidence for her ruthlessness can be found in her letters.", "In practice, her authority was always limited by the effects of the civil wars.", "Her policies, therefore, may be seen as desperate measures to keep the Valois monarchy on the throne at all costs, and her patronage of the arts as an attempt to glorify a monarchy whose prestige was in steep decline.", "Without Catherine, it is unlikely that her sons would have remained in power.", "According to Mark Strage, one of her biographers, Catherine was the most powerful woman in 16th-century Europe."]], ["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."]], ["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."]], ["G\u00fclbahar Hatun (wife of Mehmed II)", ["G\u00fclbahar Hatun( 1432 \u2013 1492) was the consort of Sultan Mehmed II, and mother of Sultan Bayezid II of the Ottoman Empire and the grandmother of Selim I."]], ["Victoria of France", ["Victoria of France (24 June 1556 \u2013 17 August 1556) and her twin sister Joan", "were the last children born to King Henry II of France and his wife, Catherine de' Medici.", "Their mother's confinement came on June 24, 1556.", "Although Joan died in the womb, Princess Victoria survived the birth\u2014only to die a little more than a month later.", "Because their birth very nearly cost their mother her life, the king's physician advised the king that there should be no more children; therefore, Henry II stopped visiting his wife's bedroom and spent all his time with his longtime mistress, Diane de Poitiers."]], ["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."]], ["Hannah Arnold", ["Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children."]], ["Kaoru Hatoyama", ["After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama."]], ["Anne Denman", ["Anne Denman( 1587\u20131661) was born in Olde Hall, Retford, Nottinghamshire.", "Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne."]], ["Marie of Valois, Duchess of Calabria", ["Marie of Valois( 1309 \u2013 23 October 1331), was the eldest daughter of Charles of Valois by his third wife Mahaut of Ch\u00e2tillon.", "She was a member of the House of Valois.", "One of her five children was Queen Joanna I of Naples."]]]
supporting_facts: [["Victoria of France", 1], ["Catherine de' Medici", 2]]
evidences: [["Victoria of France", "mother", "Catherine de' Medici"], ["Catherine de' Medici", "mother", "Madeleine de La Tour d'Auvergne"]]
answer: Madeleine de La Tour d'Auvergne