Toulouse Old Town: Treasure Quest

You are an archeologist for the Vatican, and you are in Toulouse researching about the Cathar Crusades in the Languedoc region, when you find an ancient document from the 12th century, written in Latin, pointing to the existence of a great treasure hidden somewhere in the City. 

According to this document, in Antiquity, Tolosa had great treasures, mostly gold and silver. It is believed some were war treasures while the rest came from various places in the Roman Gaul. 

The text has been severely damaged over the years, so you can’t keep reading. Nevertheless, you have a hunch that there’s more than meets the eye behind this story, and you decide to go on an unofficial quest to find out where this treasure is, and what’s the true story behind it.