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Holy Roman Empire?
On 25 December 800, Pope Leo III crowned the Frankish kingCharlemagneas Emperor, reviving the title in Western Europe, more than three centuries after the fall of the earlier ancient Western Roman Empire in 476. In theory and diplomacy, the Emperors were considered primus inter pares, regarded as first among equals amongst other Catholic monarchs across Europe.[9] The title continued in the Carolingian family until 888 and from 896 to 899, after which it was contested by the rulers of Italy in a series of civil wars until the death of the last Italian claimant, Berengar I, in 924. The title was revived again in 962 when Otto I, King of Germany, was crowned emperor, fashioning himself as the successor of Charlemagne[10] and beginning a continuous existence of the empire for over eight centuries.[11][12][e] Some historians refer to the coronation of Charlemagne as the origin of the empire,[13][14] while others prefer the coronation of Otto I as its beginning.[15][16] Scholars generally concur, however, in relating an evolution of the institutions and principles constituting the empire, describing a gradual assumption of the imperial title and role.[6][13]
The exact term "Holy Roman Empire" was not used until the 13th century, before which the empire was referred to variously as universum regnum ("the whole kingdom", as opposed to the regional kingdoms), imperium christianum ("Christian empire"), or Romanum imperium ("Roman empire"),[17] but the Emperor's legitimacy always rested on the concept of translatio imperii,[f] that he held supreme power inherited from the ancient emperors of Rome.[6] The dynastic office of Holy Roman Emperor was traditionally elective through the mostly German prince-electors, the highest-ranking noblemen of the empire; they would elect one of their peers as "King of the Romans" to be crowned emperor by the Pope, although the tradition of papal coronations was discontinued in the 16th century.
https://en.wikipedia.org/wiki/Holy_Roman_Empire
https://en.wikipedia.org/wiki/Charlemagne