In 1438 Annibale I, a putative son of Anton Galeazzo (his mother, Lina Canigiani, was said to be uncertain of the boy's paternity and the matter was decided by dice)[http://www.wga.hu/database/glossary/families/bentivol.html], led a city revolt against the Papacy. He tried to make peace with the Visconti of Milan and to convince the Pope not to place Bologna under papal dominion. In 1442, the Visconti condottiere Niccolò Piccinino imprisoned Annibale and his supporters at Varano, but Annibale was freed by Galeazzo Marescotti in 1442. When Annibale returned to Bologna, the powers of government were conferred to him, a sign that the city recognized the family's political importance. However, on 24 June 1445, with the support of Pope Eugene IV, Battista Canneschi, succeeded in assassinating his rival Annibale.