question: Who is the maternal grandmother of Catherine Of Bohemia?
context: [["Elizabeth FitzHugh", ["Elizabeth FitzHugh( 1455/65- before 10 July 1507) was an English noblewoman.", "She is best known for being the grandmother of Catherine Parr, sixth queen consort to Henry VIII, and her siblings Anne Herbert, Countess of Pembroke, and William Parr, 1st Marquess of Northampton."]], ["Margaret of Bohemia, Duchess of Bavaria", ["Margaret of Bohemia( 1313\u20131341) was the daughter of King John of Bohemia by his first wife Elisabeth of Bohemia( 1292\u20131330)."]], ["Anne of Bohemia (1290\u20131313)", ["Anne of Bohemia( 1290 \u20131313) was the eldest surviving daughter of Wenceslaus II of Bohemia and Poland and his first wife Judith of Habsburg.", "Her siblings included Elisabeth of Bohemia and Wenceslaus III of Bohemia."]], ["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."]], ["Blanche of Valois", ["Blanche of Valois (baptised \"Marguerite\"; 1317\u20131348) was a Queen consort of Germany and Bohemia by her marriage to King and later Holy Roman Emperor Charles IV.", "She was the youngest daughter of Charles of Valois and his third wife Mahaut of Ch\u00e2tillon."]], ["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."]], ["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."]], ["Hannah Arnold", ["Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children."]], ["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."]], ["Catherine of Bohemia", ["Catherine of Bohemia (19 August 1342 \u2013 26 April 1395) was Electress of Brandenburg, the second daughter of Holy Roman Emperor Charles IV and Blanche of Valois.", "Catherine was born on 19 August 1342, the third child and second surviving daughter of Charles IV, Holy Roman Emperor, and his first wife Blanche of Valois.", "On 13 July 1356, Catherine married Rudolf IV, Duke of Austria.", "The marriage was a political one arranged by her father to make peace with Austria.", "Rudolph died after nine years of childless marriage.", "On 19 March 1366, Catherine married Otto V, Duke of Bavaria."]]]
supporting_facts: [["Catherine of Bohemia", 0], ["Blanche of Valois", 1]]
evidences: [["Catherine of Bohemia", "mother", "Blanche of Valois"], ["Blanche of Valois", "mother", "Mahaut of Ch\u00e2tillon"]]
answer: Mahaut of Châtillon