There are several important temples built on Capitoline hill: the temple of Juno Moneta, the temple of Virtus, and the Temple of Jupiter Optimus Maximus Capitolinus. The Temple of Jupiter Optimus Maximus Capitolinus is the most important of the temples. It was built in 509 BC and was nearly as large as the Parthenon. The hill and the temple of Jupiter became the symbols of Rome, the capital of the world. The Temple of Saturn was built at the foot of Capitoline Hill in the western end of the Forum Romanum.
When the Senones Gauls (settled in central-east Italy) raided Rome in 390 BC, after the battle of River Allia, the Capitoline Hill was the one section of the city to evade capture by the barbarians, due to its being fortified by the Roman defenders. According to legend Marcus Manlius Capitolinus was alerted to the Gallic attack by the sacred geese of Juno. When Julius Caesar suffered an accident during his triumph, clearly indicating the wrath of Jupiter for his actions in the Civil Wars, he approached the hill and Jupiter's temple on his knees as a way of averting the unlucky omen (nevertheless he was murdered six months later, and Brutus and his other assassins locked themselves inside the temple afterward).
When the Senones Gauls (settled in central-east Italy) raided Rome in 390 BC, after the battle of River Allia, the Capitoline Hill was the one section of the city to evade capture by the barbarians, due to its being fortified by the Roman defenders. According to legend Marcus Manlius Capitolinus was alerted to the Gallic attack by the sacred geese of Juno. When Julius Caesar suffered an accident during his triumph, clearly indicating the wrath of Jupiter for his actions in the Civil Wars, he approached the hill and Jupiter's temple on his knees as a way of averting the unlucky omen (nevertheless he was murdered six months later, and Brutus and his other assassins locked themselves inside the temple afterward).
--Wikepedia
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