Illyria was an ancient region located in the western part of the Balkans, primarily covering modern-day Albania, Kosovo, and parts of Croatia and Montenegro. It was inhabited by various tribes known as the Illyrians, who were known for their warrior culture and trade with neighboring civilizations, including the Greeks and Romans. The region played a significant role in the history of the Roman Empire, as it was incorporated into the empire during the late 1st century BC. Illyria became an important military and administrative area, contributing to the spread of Roman culture and influence in the Balkans.