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Conflict with the Pope and the Italians
When Otto I became emperor, he renewed the traditions of the Carolingian empire that had been eroding for decades before Arnulf's death. Otto's empire comprised the German duchies, Lorraine (or Lotharingia), Italy, and Burgundy, which had its own nominal king. Burgundy (see Arles, kingdom of) was formally annexed in 1033.
The imperial position, however, was precarious from the start. A conflict over the relationship between the papacy and the imperial throne resulted in the investiture controversy during the reign of Henry IV (1084–1105), who appointed bishops to three sees already under the direction of papal appointees. He was also suspected of tolerating simony and other practices that the pope was trying to curb. In 1076, Henry IV withdrew his obedience to Pope Gregory VII and was excommunicated. Subsequent struggles between the popes Alexander III, Gregory IX, and Innocent IV and the emperors Frederick I and Frederick II concerned papal sovereignty in Italy. The papacy was victorious, and the emperors ceased to interfere seriously with papal affairs except during the Great Schism (see Schism, Great) of the 15th cent. and in the Italian Wars of the 16th cent.
Also untenable was the dual position of the emperors as rulers of Germany and of Italy; geography as well as cultural and political conditions separated the two countries. The defense of the empire against foreign attack was made more difficult by the repeated attempts of the emperors to maintain their authority in Italy against the opposition of the city-states (see commune), the papacy, and the petty princes. Frederick I failed to suppress the Lombard League, which had papal support. Frederick II, after inheriting Naples and Sicily, was primarily interested in Italian affairs; his conflict with the papacy produced the feud between Guelphs and Ghibellines throughout Italy and ruined the imperial authority there.
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