On May 29, 1176, the Lombard League, an alliance of northern Italian cities, defeated the forces of Holy Roman Emperor Frederick Barbarossa at the Battle of Legnano. This victory was a crucial step in the struggle for municipal independence from imperial authority and led to the Peace of Constance in 1183, which recognized the autonomy of Italian communes.

The battle became a symbol of Italian civic pride and communal liberty, celebrated in chronicles and later in patriotic poetry during the Risorgimento. The victory demonstrated the power of urban citizen militias over feudal cavalry, reflecting the rising political importance of cities that would become centers of vernacular literary culture. The communal values celebrated in accounts of Legnano influenced the civic humanism that would flourish in Italian city-states and shape Renaissance literature.