Question: What was the pantheon in the city serving as the center of imperial life in the early fifth century in the empire whose government inspired the Carolingian empire used for?

<P0-S0> the empire state building stood as the world's tallest building for nearly 40 years, from its completion in early 1931 until the topping out of the original world trade center's north tower in late 1970. following the september 11 attacks in 2001, the empire state building was again the tallest building in new york, until one world trade center reached a greater height in april 2012. the empire state building is currently the fifth - tallest completed skyscraper in the united states and the 35th - tallest in the world. <P0-S1> it is also the fifth - tallest freestanding structure in the americas. <P0-S2> when measured by pinnacle height, it is the fourth - tallest building in the united states. <SEP> <P1-S0> For almost a thousand years, Rome was the most politically important, richest and largest city in Europe. <P1-S1> Around 100 CE, it had a population of about 450,000, and declined to a mere 20,000 during the Early Middle Ages, reducing the sprawling city to groups of inhabited buildings interspersed among large areas of ruins and vegetation. <SEP> <P2-S0> Under Charlemagne the Franks reached the height of their power. <P2-S1> The Carolingian Empire was a conscious effort to recreate a central administration modeled on that of the Roman Empire,[13] but the motivations behind military expansion differed. <P2-S2> After campaigns against Lombards, Avars, Saxons, and Basques, the resulting Carolingian Empire stretched from the Pyrenees to Central Germany, from the North Sea to the Adriatic. <P2-S3> In 800 the Pope made Charlemagne Emperor of the West in return for protection of the Church. <P2-S4> Charlemagne hoped to provide his nobles an incentive to fight by encouraging looting on campaign. <P2-S5> Plunder and spoils of war were stronger temptations than imperial expansion, and several regions were invaded over and over in order to bolster the coffers of Frankish nobility. <P2-S6> [14] Cavalry dominated the battlefields, and while the high costs associated with equipping horses and horse-riders helped limit their numbers, Carolingian armies maintained an average size of 20,000 by recruiting infantry from imperial territories near theaters of operation. <P2-S7> [15] The Empire lasted from 800 to 843, when, following Frankish tradition, it was split between the sons of Louis the Pious by the Treaty of Verdun. <SEP> <P3-S0> The Pantheon (/ ˈpænθiən / or US: / ˈpænθiɒn /; Latin: Pantheum, from Greek Πάνθειον Pantheion, ``(temple) of all the gods '') is a former Roman temple, now a church, in Rome, Italy, on the site of an earlier temple commissioned by Marcus Agrippa during the reign of Augustus (27 BC -- 14 AD). <P3-S1> The present building was completed by the emperor Hadrian and probably dedicated about 126 AD. <P3-S2> He retained Agrippa's original inscription, which has caused confusion over its date of construction as the original Pantheon burned down, so it is not certain when the present one was built. <SEP> <P4-S0> fall river government center (also known as "city hall") is the location of the municipal government offices in the city of fall river, massachusetts, united states. <P4-S1> located at one government center, and constructed directly over interstate 195, it was the first public building built over a federal interstate highway. <P4-S2> it replaced the city's historic 19th century city hall which had been demolished in the early 1960s as part of the construction of interstate 195, which cuts through the center of the city's downtown area. <P4-S3> delayed and plagued by problems during construction, the new city hall opened in 1976. in 2008, the building and site underwent a multimillion-dollar exterior renovation.