question: Who is the paternal grandfather of Bolesław Januszowic?
context: [["Janusz I of Warsaw", ["Janusz I of Warsaw (pl: \"Janusz", "I warszawski\"), also known as Janusz I the Old", "(pl: \"", "Janusz I Starszy\")", "(c. 1347/52 \u2013 8 December 1429), was a Polish prince member of the House of Piast in the Masovian branch, from 1373/74 Duke of Warsaw and after the division of the paternal inheritance between him and his brother in 1381, ruler over Nur, \u0141om\u017ca, Liw, Ciechan\u00f3w, Wyszogr\u00f3d and Zakroczym.", "In addition, he was a vassal of the Polish Kingdom since 1391 for the fief of Podlachia (only during his lifetime).", "He was the eldest son of Siemowit III, Duke of Masovia and his first wife Euphemia, daughter of Nicholas II of Opava.", "Due to an error of chronicler Jan D\u0142ugosz was previously assumed that Janusz I was born c. 1329, and it wasn't until modern time that this date could be corrected until a much later one, c. 1346.", "Evidence of this fact was that only in 1373/74 he received his own duchy (with its capital in Warsaw).", "As the result of the partition of Masovia between him and his younger brother Siemowit IV after the death of their father on 16 June 1381, Janusz I finally obtain the totally of his domains: Warsaw, Nur, \u0141om\u017ca, Liw, Ciechan\u00f3w, Wyszogr\u00f3d and Zakroczym."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["Boles\u0142aw Januszowic", ["Boles\u0142aw Januszowic (1385/86 \u2013 ca. 4 May 1424), was a Polish prince member of the House of Piast.", "He was the second son of Duke Janusz I of Warsaw and Danut\u0117 of Lithuania, a daughter of K\u0119stutis."]], ["Henry Krause", ["Henry J.\" Red\" Krause, Jr.( August 28, 1913 \u2013 February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.", "He played college football at St. Louis University.", "He is the grandfather of Jennifer Krause", "He is the great grandfather of Payton Hoeing"]], ["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."]], ["Boles\u0142aw IV of Warsaw", ["Boles\u0142aw IV of Warsaw( also known as Boleslaus IV of Warsaw,; \u2013 10 September 1454), was a Polish prince member of the House of Piast in the Masovian branch.", "He was Duke of Warsaw during 1429 \u2013 1454( under regency until 1436) and sovereign Duke of Podlachia in 1440 \u2013 1444.", "He was the second son of Boles\u0142aw Januszowic( in turn second son of Janusz I of Warsaw) and Anna Feodorovna of Ratnie, a Lithuanian princess( granddaughter of Algirdas)."]], ["Fred Le Deux", ["Frederick\" Fred\" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).", "He is the grandfather of Tom Hawkins."]], ["Zhao Shoushan", ["Zhao Shoushan( 12 November 1894 \u2013 20 June 1965) was a KMT general and later Chinese Communist Party politician.", "He is the grandfather of Zhao Leji."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]]]
supporting_facts: [["Boles\u0142aw Januszowic", 1], ["Janusz I of Warsaw", 6]]
evidences: [["Boles\u0142aw Januszowic", "father", "Janusz I of Warsaw"], ["Janusz I of Warsaw", "father", "Siemowit III, Duke of Masovia"]]
answer: Siemowit III, Duke of Masovia