question: Who is the maternal grandfather of Yolanda Of Vianden?
context: [["Margaret, Marchioness of Namur", ["Margaret, Marchioness of Namur (c. 1194 \u2013 17 July 1270) was ruling Marchioness of Namur in 1229-1237.", "She was the daughter of Peter II of Courtenay and Yolanda of Flanders."]], ["Prithvipati Shah", ["Prithvipati Shah( ?\u20131716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.", "He was the grandfather of Nara Bhupal Shah."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["Geoffrey I of Vianden", ["Geoffrey I of Vianden\" 7th duke of Vianden 1273- 1310\"( 1310) was a son to duke Filips I of Vianden and Mary of Brabant- Perwez.", "He succeeded to his father in 1273 in Vianden.", "Geoffrey married Aleidis of Oudenaarde( 1260- 1305) and Lutgardis van Ligny and fathered:"]], ["Otto II of Nassau", ["Otto II of Nassau( \u2013 1351) was a German nobleman.", "He was a Count of Nassau- Dillenburg in Siegen and Dillenburg, and was a son of Count Heinrich of Nassau and Adelheid of Heinsberg.", "Otto married Adelheid of Vianden, daughter of Philip of Vianden and Adelheid of Arnsberg.", "They had four children:"]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Kaya Alp", ["Kaya Alp was, according to Ottoman tradition, the son of K\u0131z\u0131l Bu\u011fa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertu\u011frul, and the great grandfather of the Ottoman Empire founder, Osman I."]], ["Yolanda of Vianden", ["Mother Yolanda (or Yolande, Iolanda) of Vianden, O.P., (1231\u20131283) was the youngest daughter of Count Henry I of Vianden and Margaret, Marchioness of Namur.", "She joined the Dominican monastery in Marienthal, Luxembourg, against the wishes of her parents when she was very young.", "She later became its devout prioress and is now a legend in the history of that nation."]], ["Princess Yolanda of Savoy", ["Princess Yolanda of Savoy (1 June 1901 \u2013 16 October 1986) was the eldest daughter of King Victor Emmanuel III of Italy."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]]]
supporting_facts: [["Yolanda of Vianden", 0], ["Margaret, Marchioness of Namur", 1]]
evidences: [["Mother Yolanda (or Yolande, Iolanda) of Vianden", "mother", "Margaret, Marchioness of Namur"], ["Margaret, Marchioness of Namur", "father", "Peter II of Courtenay"]]
answer: Peter II of Courtenay