GALEAZZO I. (1277-1328), who ruled at Milan from 1322 to 1328, defeated the Holy Army which the pope had sent against the Visconti at Vaprio on the Adda (1324), with the aid of the emperor Louis the Bavarian. In 1327 he was imprisoned for a short time by the emperor at Monza because he was thought guilty of making peace with the church. By his wife Beatrice d'Este he had the son Azzo who succeeded him. His brother MARCO commanded a band of Germans, conquered Pisa and Lucca and died in 1329. Azzo (1302-1339), who succeeded his father in 1328, bought the title of imperial vicar for 25,00o florins from the same Louis who had imprisoned Galeazzo I. He conquered
ten towns, murdered his uncle Marco (1329), suppressed a revolt led by his cousin Lodrisio, reorganized the administration of his estates, built the octagonal tower of S. Gottardo, and was suc ceeded in turn by his uncles Lucchino and Giovanni. LUCCHINO made peace with the church in 1341, bought Parma from Obizzo d'Este and made Pisa dependent on Milan. He was poisoned in 1349 by his wife Isabella Fieschi.