question: Who is Konrad V Kantner's paternal grandfather?
context: [["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Konrad III the Old", ["Konrad III the Old( \u2013 28 December 1412) was a Duke of Ole\u015bnica, Ko\u017ale, half of Bytom and half of \u015acinawa since 1377( until 1403 with his father as co-ruler).", "He was the only son of Konrad II the Gray, Duke of Ole\u015bnica, by his wife Agnes, daughter of Casimir I, Duke of Cieszyn."]], ["Konrad IX the Black", ["Konrad IX the Black( c. 1415 \u2013 14 August 1471) was a duke of Ole\u015bnica, Ko\u017ale, half of Bytom and half of \u015acinawa since 1450( with his brothers as co-rulers), and since 1452 sole ruler over Ole\u015bnica, Ko\u017ale and half of Bytom.", "He was the eldest son of Konrad V Kantner, Duke of Ole\u015bnica by his wife Margareta."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Konrad V Kantner", ["Konrad V Kantner( ca. 1385 \u2013 10 September 1439) was a duke of Ole\u015bnica, Ko\u017ale, half of Bytom and half of \u015acinawa during 1412 \u2013 1427( with his brothers as co-rulers), since 1427 sole ruler over Ole\u015bnica.", "He was the second son of Konrad III the Old, Duke of Ole\u015bnica, by his wife Judith.", "Like his one older and three younger brothers, at the baptism he received the name of Konrad, which was characteristic in this branch of the House of Piast.", "His nickname of\" Kantner\" was derived from the town of Kanth( pl:\" K\u0105ty Wroc\u0142awskie\"), who was a property of the Ole\u015bnica dukes since 1379."]], ["Guillaume Wittouck", ["Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.", "He was the Grandfather of industrialist Paul Wittouck."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["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."]], ["Fujiwara no Nagara", [", also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.", "He was the grandfather of Emperor Y\u014dzei."]], ["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."]]]
supporting_facts: [["Konrad V Kantner", 1], ["Konrad III the Old", 1]]
evidences: [["Konrad V Kantner", "father", "Konrad III the Old"], ["Konrad III the Old", "father", "Konrad II the Gray"]]
answer: Konrad II the Gray