city, Lombardia (Lombardy) regione, northern Italy, on the Olona River. An unimportant Roman settlement called Leunianum, it became the site of a fortified castle of the bishops of Milan in the 11th century and in 1176 was the scene of a decisive defeat of the Holy Roman emperor Frederick I Barbarossa by the forces of the Lombard League. A monument built in 1876 by Enrico Butti commemorates the victory.
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