Beroea of Epirus in the context of Glaukias

The Illyrian kingdom was an Illyrian political entity that existed on the western part of the Balkan Peninsula in ancient times. Regardless of the number of the alternately ruling dynasties, of their tribal affiliation, and of the actual extension of their kingdom, it represented an alliance of Illyrian tribes that united under the rulership of a single leader, expressly referred to as "King of the Illyrians" in ancient historical records (whether in Ancient Greek or in Latin). The monarchic superstructure of the Illyrian state coexisted with the Illyrian tribal communities and the republican system of the Illyrian koina.

The Enchele's polity was the earliest to emerge among Illyrians. The earliest known Illyrian king – Bardylis – emerged in southern Illyria around 400 BC, most likely centered in Dassaretis, a region along Lake Ohrid and east to the Prespa Lakes, located on the border between Macedon and Epirus. He aimed to make Illyria a regional power interfering with Macedon. He united many southern Illyrian tribes under his realm and defeated the Macedonians and Molossians several times, expanding his dominion over Upper Macedonia and Lynkestis and subjugating Macedon for several decades until he was decisively defeated by Philip II of Macedon. Before the Rise of Macedon Illyrians were the dominant power in the area. The kingdom of the Taulantii on the south-eastern coast of the Adriatic evidently reached its apex under Glaukias' rule and dominated southern Illyrian affairs in the late 4th century BC, exerting great influence on the Epirote state through the close ties with the Molossian king Pyrrhus.

Glaucias (Ancient Greek: Γλαυκίας; ruled c. 335 – c. 295 BC) was a ruler of the Taulantian kingdom, situated in modern day Albania, which dominated southern Illyrian affairs in the second half of the 4th century BC. Glaucias is first mentioned as bringing a considerable force to the assistance of Bardylis' son Cleitus, an Illyrian prince who revolted against Alexander the Great, in the battle of Pelium 335 BC. They were, however, both defeated, and Cleitus was forced to take refuge within the Taulantian territories, whither Alexander did not pursue him, his attention being called elsewhere by the news of the revolt of Thebes.

We next hear of Glaucias, nearly 20 years later, as affording an asylum to the infant Pyrrhus, when his father Aeacides was driven out of Epirus; Glaucias' wife Beroea belonged to the Molossian Aeacidae. By this measure he gave offence to Cassander, who sought to gain possession of Epirus for himself, and who in vain offered Glaucias 200 talents to give up the child.