With the reign of Constantine I, the Bishop of Rome gained political as well as religious importance, eventually becoming known as the Pope and establishing Rome as the centre of the Catholic Church. After the Sack of Rome in 410 AD by Alaric I and the fall of the Western Roman Empire in 476 AD, Rome alternated between Byzantine and Germanic control. Its population declined from 700,000 in 410 to 600,000 in 425, 450,000 in 450, 150,000 in 500, 90,000 in 700 to a mere 30,000 during the Early Middle Ages[citation needed], reducing the sprawling city to groups of inhabited buildings interspersed among large areas of ruins and vegetation. Rome remained nominally part of the Byzantine Empire until 751 AD, when the Lombards finally extinguished the Exarchate of Ravenna which was the last holdout of the Byzantines in northern Italy. In 756, Pepin the Short gave the Pope temporal jurisdiction over Rome and surrounding areas, thus creating the Papal States. In 846, Muslim Arabs invaded Rome and looted St. Peter's Basilica.
Rome remained the capital of the Papal States until its annexation by the Kingdom of Italy in 1870; the city became a major pilgrimage site during the Middle Ages and the focus of struggles between the Papacy and the Holy Roman Empire starting with Charlemagne, who was crowned its first emperor in Rome in 800 by Pope Leo III. Apart from brief periods as an independent city during the Middle Ages, Rome kept its status as Papal capital and "holy city" for centuries, even when the Papacy briefly relocated to Avignon (1309-1377).
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