One of this entity's leaders formed the "Company of Death" that notably employed a war wagon known as the Carroccio. Founded through an oath taken at Pontida, this entity was left isolated following the defeat of a so-called "Commune" at Monte Porzio. This entity organized the Diet of Roncaglia and won its largest victory largely due to the lack of participation by (*) Henry the Lion, who chose instead to consolidate power in Saxony. This group won the Battle of Legnano against its major rival, who had earlier sacked Milan after a dispute with this group's major ally, 
One of this entity's leaders formed the "Company of Death" that notably employed a war wagon known as the Carroccio. Founded through an oath taken at Pontida, this entity was left isolated following the defeat of a so-called "Commune" at Monte Porzio. This entity organized the Diet of Roncaglia and won its largest victory largely due to the lack of participation by (*) Henry the Lion, who chose instead to consolidate power in Saxony. This group won the Battle of Legnano against its major rival, who had earlier sacked Milan after a dispute with this group's major ally, Pope Alexander III. For 10 points, identify this group of Italian states that fought Frederick Barbarossa, a "league" named for a Northern Italian region.
One of this entity's leaders formed the "Company of Death" that notably employed a war wagon known as the Carroccio.
the {Lombard} League