Initially, the entry price to the thermal bath facilities was a quadrans, or a quarter of an as, a bronze coin that was widespread during the Republic and the Roman Empire.
In 33 BC Agrippa, in order to make his magistracy immortal, decided to bear the cost of entry to the public baths of Rome, making them free for all citizens.
From that moment a real revolution began, linked to the concept of protection of the masses, which then characterised much of the imperial period.
