This group was opposed by a conspiracy led by Giorgio Lampugnino and Teodoro Bossi, although it was unsuccessful. Perugia and Orvieto were controlled by this group, which also seized power in the elections of the Captains and Defenders of the Liberty of Milan. The losers of the Battle of Monteperti, this group's name orginated at the Battle of Weinsberg, and they usually controlled Genoa and Bologna. Pope Boniface VIII led to this group splitting itself into White and Black factions. For ten points, identify this Italian faction perhaps best known for being the rivals 
This group was opposed by a conspiracy led by Giorgio Lampugnino and Teodoro Bossi, although it was unsuccessful. Perugia and Orvieto were controlled by this group, which also seized power in the elections of the Captains and Defenders of the Liberty of Milan. The losers of the Battle of Monteperti, this group's name orginated at the Battle of Weinsberg, and they usually controlled Genoa and Bologna. Pope Boniface VIII led to this group splitting itself into White and Black factions. For ten points, identify this Italian faction perhaps best known for being the rivals of the Ghibellines.
This group was opposed by a conspiracy led by Giorgio Lampugnino and Teodoro Bossi, although it was unsuccessful.