Cremona is first mentioned in history as a settlement of the Cenomani, a Gallic (Celtic) tribe that arrived in the Po valley around 400 BC. However, the name Cremona most likely dates back to earlier settlers and puzzled the ancients, who gave many fanciful interpretations. In 218 BC the Romans established on that spot their first military outpost (a colonia) north of the Po river, and kept the old name. These are some images of the Cathedral Square or City Hall.