The scaligeri expanded their empire to its maxmium
Beginning in 1259 with only Verona, the Scaligeri obtained Vicenza from Padua.
Cangrande I fought for years to take Padua , a city that was fervently Guelf (siding with the pope.) Cangrande I eventually owned these three cities, plus Treviso, Belluno, Feltre, Monselice, Bassano. The taking of Treviso led directly to his death: it is suggested that he drank poisoned water shortly after this accomplishment while in Treviso.
His two sons continued this expansion and added Brescia, Parma, Lucca before threatened neighbors reduced the dominion back to its original size of Verona and Vicenza.
image courtesy of Sacranon