According to Roman tradition, the Mamertine Prison (known in Roman times as the "Tullianum") was built by the legendary 4th King of Rome, Ancus Marcius, ca. 640-616 BC.
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The Mamertine Prison held people who were awaiting either
execution or trial. A famous person held there was the king of
Numidia, Jugurtha.
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Some of the earliest forms of imprisonment were: cages, stone
quarries and similar places and Mamertine Prison.