The Frigidus River, known for its cold waters, is a significant waterway in Italy. It flows through picturesque landscapes, providing a habitat for various wildlife and plants. The river is not only a natural wonder but also a historical site, as it played a role in ancient battles and trade routes. In AD 394, the Frigidus River was the backdrop for a famous battle between the forces of the Roman Emperor Theodosius I and the usurper Eugenius. This event marked a crucial moment in Roman history, influencing the future of the empire and its territories. Today, the river remains a symbol of both natural beauty and historical significance.