What was the Forum prison known as in ancient Rome?

The Forum prison in ancient Rome is known as the Mamertinum. This facility had significant historical importance as it was used to detain various prisoners, including notable figures in Roman history. The Mamertinum is often recognized for its location near the Roman Forum and its association with the political and social events of the time.

It served as a place for imprisonment and execution, with many historical accounts indicating that it housed significant prisoners like Catiline conspirators and other political figures accused of treason. Its structure and function highlight the Roman approach to justice and punishment, aligning with their broader practices regarding law and governance during the Republic and into the Empire.

The other options refer to different locations or buildings in ancient Rome. The Tullianum, for example, was indeed another well-known prison, but it is typically described as part of the Mamertinum structure. The Regia was the official residence of the Pontifex Maximus and served religious and administrative functions, while the Temple of Vesta was a sacred space dedicated to the goddess Vesta and was not used as a prison.