Original: Battle of Casalecchio : Gian Galeazzo Visconti , the Duke of Milan , crushes the forces of Bologna and Florence , but he dies from a fever later this year and is succeeded by his son Gian Maria Visconti .
Simplified: Events June 26 - Battle of Casalecchio - Gian Galeazzo Visconti , the Duke of Milan , crushes the forces of Bologna , but he dies later that year .