The fibula or Roman safety pin

As you take the path up to the Platé refuge, you'll come across a passageway that was already in use in ancient Roman times, as a way of crossing the "Fiz walls." In fact, a fibula - a type of fastener and precursor of the modern safety pin, which was used to fasten and secure garments - has been found here.
It dates back to the High Roman Empire, i.e. between AD 10 and AD 80!