question: Where was the father of Gian Maria Visconti born?
context: [["Obata Toramori", ["He was the father of Obata Masamori."]], ["Agnese del Maino", ["Agnese del Maino( c. 1411 \u2013 13 December 1465) was a Milanese noblewoman and the mistress of Filippo Maria Visconti, the last legitimate Duke of Milan of the Visconti dynasty.", "Agnese was the mother of Bianca Maria Visconti, who succeeded to the title of Duchess of Milan in 1450, despite her illegitimacy."]], ["Filippo Maria Visconti (bishop)", ["Filippo Maria Visconti( 1721\u20131801) was the Archbishop of Milan from 1784 to 1801."]], ["Gian Maria Visconti", ["Gian Maria Visconti (or Giovanni Maria; 7 September 1388 in Abbiategrasso \u2013 16 May 1412) was the second Visconti Duke of Milan, the son of Gian Galeazzo Visconti and Caterina Visconti."]], ["Caterina Visconti", ["Caterina Visconti (1361 \u2013 17 October 1404) was Duchess of Milan as the second spouse of Gian Galeazzo Visconti, the first Duke of Milan, and was the mother of two succeeding Dukes of Milan, Gian Maria and Filippo Maria Visconti.", "Caterina served as Regent of Milan from 1402 to 1404, during her elder son's minority, but due to Gian Maria's suspicion of her alleged treason (planted in his mind by her enemy, the condottiero Facino Cane), he had his mother arrested and imprisoned in the castle of Monza, where she was presumably poisoned in 1404."]], ["Giovanni Visconti (cyclist)", ["Giovanni Visconti( born 13 January 1983) is an Italian professional road racing cyclist, who currently rides for UCI Professional Continental team."]], ["Alberto Visconti", ["Alberto Visconti( born 1901, date of death unknown) was an Italian bobsledder.", "He competed in the four- man event at the 1924 Winter Olympics."]], ["Mario Visconti", ["Mario Visconti( born 23 October 1968) is a former professional tennis player from Italy."]], ["Gian Galeazzo Visconti", ["Gian Galeazzo Visconti (16 October 1351 \u2013 3 September 1402), son of Galeazzo II Visconti and Bianca of Savoy, was the first Duke of Milan (1395) and ruled the late-medieval city just before the dawn of the Renaissance.", "He was the founding patron of the Certosa di Pavia, completing the Visconti Castle at Pavia begun by his father and furthering work on the Duomo of Milan."]], ["Pietro Visconti", ["Pietro Visconti( born 24 May 1989) is an Italian football player who plays for Novara."]]]
supporting_facts: [["Gian Maria Visconti", 0], ["Gian Galeazzo Visconti", 1]]
evidences: [["Gian Maria Visconti", "father", "Gian Galeazzo Visconti"], ["Gian Galeazzo Visconti", "place of birth", "Pavia"]]
answer: Pavia