It was under the Hohenstaufen emperors – primarily Frederick I, Henry VI and Frederick II – that the Holy Roman Empire achieved its greatest power and influence. Frederick I (1152-1190) battled in Italy to preserve imperial rights and died on the Third Crusade in Asia. Henry VI (1190 – 1197) may have been the most powerful and successful emperor. His marriage in 1186 to Constanza (Constance), the sole heiress of the crown of Sicily, united the empire with perhaps the wealthiest Kingdom in Europe: Sicily. It was the worst nightmare for the now surrounded papacy. Frederick II (1198-1250), the son of Henry and Constanza, dazzled Europe with his many accomplishments – in his day he was known as stupor mundi (wonder of the world). He warred for decades again the popes. Yet this war to the death with the papacy eventually fatally weakened the central power of the empire.
The Holy Roman Empire revolved around Germany from 962 to 1806. Yet, as a result of Henry VI’s marriage to Constance, the period after 1190 through much of the 13th century forms an exception. In this era Italy emerged as the new center of the empire. Frederick II ruled mainly from Sicily and Naples even though the kingdom of Sicily, as oppposed to Northern Italy, previously had never been considered part of the empire at all. Certainly the most enthusiastic partisans of the empire in the 13th century – the Ghibillines and similar parties – were now found south of the Alps. It took the papacy decades of war to eliminate the last of the Hohenstaufen (Manfred, Conradin) from the Italian peninsula.
This history is why today we stand in wonder before the magnificent porphyry sarcophagi of Henry VI and Fredrick II in a side chapel of the cathedral of far-off Palermo. These are perhaps the most magnificent tombs of Holy Roman emperors, carved in the same rare stone we also can still see in late Roman imperial sarcophagi especially in the Vatican museums but also in Constantinople. Thus, continuity was established with the Roman empirs prior to the coronation of Charlemagne in 800.
Yet it is fitting that these emperors rest here, so far from their ancestral home or even Northern Italy. For, after the accomplishments of Frederick I, it seemed that Henry VI was at last achieving the promise of the empire to restore the unity of Christendom. Within his own domains, the German princes and the Italian city states suspended their opposition to the expansion of Imperial authority. Even the papacy adopted an accomodating policy. Within Europe, England, Denmark, Hungary and others accepted Henry’s overlordship. And the union with the Kingdom of Sicily opened up unheard-of vistas of a truly worldwide realm. Henry forced the Byzantine emperor to pay tribute, his authority was acknowledged by the Armenian kingdom and the kingdom of Jerusalem. Henry in 11197 was assembing a mainly German army for a crusade in the East. But then he died, leaving an infant son (the future Frederick II). The laboriously constructed structures and relationships of his vast realm collapsed. The stability of the Holy Roman Empire depended far too much on the personality of the ruler. After Henry’s death, some 20 years of succession disputes followed in what, after all, always remained an elective monarchy. It was in this period that the papacy, under Innocent III reached the apogee of its power over Christendom.
Frederick II could only be crowned emperor in 1220. He had, if anything, even more exraordinary “charismatic” and intellectual gifts than his father or grandfather. Fantastic hopes and expectations surrounded him. Yet by the time Fredrick was able to exercise undisputed rule, the papacy, the Italian city states and the German princes – not to mention the kingdom of France – had all gained dramatically in power and influence. The result was an endless struggle with the popes and their allies – primarily in Italy – and the decline of the central power of the emperor. The body of Frederick II still reposes in the capital of the kingdom of Sicily, where he spent most of the later years of his life.