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Why did Frederick II promise to keep Sicily separate from the German empire?

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Frederick II promised to keep the Kingdom of Sicily separate from the Holy Roman Empire primarily to satisfy the demands of the papacy, which sought to prevent the encirclement of the Papal States by a single, powerful ruler.1

By maintaining this separation, Frederick aimed to secure papal support for his imperial ambitions, including his election as king of Germany and his eventual coronation as emperor. The papacy, particularly under Innocent III, viewed the union of Sicily and Germany as a strategic threat and exacted promises from Frederick that his son, Henry VII, would rule Sicily while Frederick focused on the empire.12

Although Frederick formally confirmed this legal separation during his coronation in 1220, the reality of the situation remained complex, as he continued to maintain a personal union over both territories. This promise was a central component of the diplomatic cooperation between the emperor and the Holy See during the early years of his reign.31