The Temple of Jupiter, Capitolium, or Temple of the Capitoline Triad was a temple in Roman Pompeii, at the north end of its forum. Initially dedicated to Jupiter alone, it was built in the mid-2nd century BC at the same time as the temple of Apollo was being renovated - this was the area at which Roman influence over Pompeii increased and so Roman Jupiter superseded the Greek Apollo as the town's highest god. Jupiter was the ruler of the gods and the protector of Rome, where his temple was the center of Roman Religion and of the cult of state.
As the most important divinity in Ancient Rome, many temples were built to honor Jupiter or the entire Capitoline Triad in towns newly conquered by the Romans. This held true for Pompeii, where the previously existing Temple of Jupiter was enlarged and Romanized upon conquest.
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