question: Who is the maternal grandfather of Count Michael Mikhailovich Of Torby?
context: [["Guillaume Wittouck", ["Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.", "He was the Grandfather of industrialist Paul Wittouck."]], ["Countess Marie von Hochberg", ["Princess Marie of Hanover( born 26 November 1952 in Pattensen, Lower Saxony, Germany), is the wife of Count Michael von Hochberg."]], ["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."]], ["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."]], ["Sophie of Merenberg", ["Countess Sophie Nikolaievna of Merenberg, Countess de Torby (1 June 1868 \u2013 14 September 1927), also known as \"Countess Torbay\", was the elder daughter of Prince Nikolaus Wilhelm of Nassau and his morganatic wife, Natalia Alexandrovna Pushkina (who had been granted the title of Countess of Merenberg)."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["Michael de la B\u00e9doy\u00e8re", ["Count Michael Anthony Maurice de la B\u00e9doy\u00e8re( 1900 \u2013 1973) was an English author, editor and journalist."]], ["Count Michael Mikhailovich of Torby", ["Count Michael Mikhailovich de Torby (8 October 1898 in Wiesbaden \u2013 25 April 1959 in London) was the son of Grand Duke Michael Mikhailovich of Russia (1861\u20131929) and his morganatic wife Countess Sophie of Merenberg (1868\u20131927).", "The great-grandson of Emperor Nicholas I of Russia and Alexander Pushkin."]], ["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: [["Count Michael Mikhailovich of Torby", 0], ["Sophie of Merenberg", 0]]
evidences: [["Count Michael Mikhailovich de Torby", "mother", "Sophie of Merenberg"], ["Sophie of Merenberg", "father", "Prince Nikolaus Wilhelm of Nassau"]]
answer: Prince Nikolaus Wilhelm of Nassau