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Giacomo della Chiesa was born at Pegli, a suburb of Genoa, Italy, the third son of Marchese Giuseppe della Chiesa and his wife Marchesa Giovanna Migliorati. Genealogy findings report that his father's side produced Pope Callixtus II and also claimed descent from Berengar II of Italy and that his maternal family produced Pope Innocent VII. He is also a descendant of Blessed Antonio della Chiesa.