From 8th century BCE, Illyrian tribes evolved into kingdoms. The earliest recorded kingdom in Illyria (a region in the western part of the Balkan Peninsula inhabited by the Illyrians, as recorded in classical antiquity) was the Enchele in the 8th century BCE. The era in which we observe other Illyrian kingdoms begins approximately at 400 BCE and ends at 167 BCE. The Autariatae under Pleurias (337 BCE) were considered to have been a kingdom. The Kingdom of the Ardiaei (originally a tribe from the Neretva valley region) began at 230 BCE and ended at 167 BCE. The most notable Illyrian kingdoms and dynasties were those of Bardylis of the Dardani and of Agron of the Ardiaei who created the last and best-known Illyrian kingdom. Agron ruled over the Ardiaei and had extended his rule to other tribes as well.