Charles of Anjou helped this group in establishing themselves in their most important city where the Donati and Cerchi families created "black" and "white" factions, Florence.
The Privilegium Minus placated this group's member Henry the Lion with the creation of the Duchy of Austria. Their titular rebellion occurred while Conrad III was fighting the Second Crusade, and they supported Otto IV during the succession dispute with Frederick of Sicily for the Imperial crown. Charles of Anjou helped this group in establishing themselves in their most important city where the Donati and Cerchi families created "black" and "white" factions, Florence. Also controlling Milan, Genoa and Bologna, their main opponents controlled Siena, Arezzo, and Pisa. For 10 points, name this political faction from the 12th to 14th centuries in Germany and Italy who supported mercantile interests and the papacy against the Holy Roman Emperor, and were pitted against the Ghibellines.
The Privilegium Minus placated this group's member Henry the Lion with the creation of the Duchy of Austria.
Guelphs [or Guelfs; or Welfs]