Gaulish refers to the Celtic language spoken by the ancient inhabitants of Gaul, a region that included modern-day France, Belgium, and parts of Switzerland, Italy, and Germany. This language was part of the Celtic language family and was used until the Roman conquest, after which it gradually declined in favor of Latin. The Gaulish people were known for their rich culture, which included unique art, religion, and social structures. They interacted with various civilizations, including the Romans and Germans, influencing and being influenced by these cultures. Today, Gaulish is primarily studied through inscriptions and historical texts.