The
Lombard League was an alliance formed around
1167, which at its apex included most of the cities of
northern Italy (although its membership changed in time), including, among others,
Milan,
Piacenza,
Cremona,
Mantua,
Crema,
Bergamo,
Brescia,
Bologna,
Padua,
Treviso,
Vicenza,
Venice,
Verona,
Lodi,
Reggio Emilia and
Parma, and even some lords, such as the
Marquis Malaspina and
Ezzelino da Romano. The League was formed to counter the
Holy Roman Empire's
Frederick I, who was attempting to assert Imperial influence over
Italy. Frederick claimed direct Imperial control over Italy at the
Diet of Roncaglia (
1158). The League had the support of
Pope Alexander III, who also wished to see Imperial power in Italy decline. At the
Battle of Legnano on 29 May 1176, Frederick I was defeated and, by the
Peace of Venice, which took place in 1177, agreed to a six-year truce from August,
1178 to
1183, until the
Peace of Constance, where the Italian cities agreed to remain loyal to the Empire but retained local jurisdiction over their territories.
The Lombard League was renewed several times and after 1226 regained its former prestige by countering the efforts of
Frederick II to gain greater power in Italy. These efforts included the taking of
Vicenza and the
Battle of Cortenuova which established the reputation of the Emperor as a skillful strategist. He misjudged his strength, rejecting all Milanese peace overtures and insisting on unconditional surrender. It was a moment of grave historic importance when Frederick's hatred coloured his judgment and blocked all possibilities of a peaceful settlement. Milan and five other cities held out, and in October
1238 he had to unsuccessfully raise the siege of
Brescia. Once again receiving
papal support, the Lombard League effectively countered Frederick's efforts. During the 1249 siege of
Parma, the Imperial camp was assaulted and taken, and in the ensuing Battle of Parma the Imperial side was routed. Frederick lost the Imperial treasure and with it any hope of maintaining the impetus of his struggle against the rebellious communes and against the pope. The League was dissolved in
1250 once Frederick died.