Molossians

The Molossians (Ancient Greek: Μολοσσοί, Molossoi) were an ancient Greek tribal state and kingdom that inhabited the region of Epirus since the Mycenaean era. On their north frontier, they had the Chaonians and on their southern frontier the kingdom of the Thesprotians. The Molossians were part of the League of Epirus until they sided against Rome in the Third Macedonian War (171–168 BC). The result was disastrous, and the vengeful Romans enslaved 150,000 of its inhabitants and annexed the region into the Roman Republic.

According to Greek mythology, the Molossians were the descendants of Molossus, one of the three sons of Neoptolemus, son of Achilles and Deidamia. Following the sack of Troy, Neoptolemus and his armies settled in Epirus where they joined with the local population. Molossus inherited the kingdom of Epirus after the death of Helenus, son of Priam and Hecuba of Troy, who had married his erstwhile sister-in-law Andromache after Neoptolemus's death. According to some historians, their first king was Phaethon, one of those who came into Epirus with Pelasgus. According to Plutarch, Deucalion and Pyrrha, having set up the worship of Zeus at Dodona, settled there among the Molossians.

...
Wikipedia