This was the name of an a
This was the name of an anti-Prussian party led by Ludwig Windthorst. This was the name of a legion that was sponsored from 1866-1870 by a blind George V to try and regain lost lands and territories. The only Holy Roman Emperor from a house of this name was excommunicated by Innocent III for trying to conquer Sicily from his future successor, Frederick II; that member of this house was (*) Otto IV. This house under Henry the Lion was defeated by Frederick Barbarossa and lost its ancient duchies of Saxony and Bavaria. Since this house were the electors of Hanover that frequently challenged Hohenstaufen power, this word also applies to a group that supported the Pope in opposition to the Holy Roman Emperor. For 10 points, name this word that names a group opposed to the Ghibellines.
This was the name of an anti-Prussian party led by Ludwig Windthorst.
House of Guelph [or Guelphs, Guelphic, and all variants based on Welf and Guelf; prompt on House of Hanover or House of Este]