The people who overran Greece around 1300 BCE were the Mycenaeans. The Mycenaeans were an ancient Greek civilization that emerged during the Late Bronze Age and dominated the Greek mainland and parts of the Aegean region from approximately 1600 BCE to 1100 BCE.
The Mycenaeans were named after their most prominent city, Mycenae, located in the northeastern Peloponnese. They were known for their advanced military capabilities, impressive fortifications, extensive trade networks, and sophisticated culture. The Mycenaeans were skilled warriors and were involved in conflicts with other civilizations of the time, including the Trojans, as described in the epic poems of the Iliad and the Odyssey.
The Mycenaean civilization reached its peak around 1300 BCE but later faced decline and eventual collapse around 1100 BCE, often attributed to a combination of factors such as warfare, natural disasters, and possible invasions by other groups, including the Dorians. The decline of the Mycenaeans marked the end of the Late Bronze Age in Greece and the beginning of a period referred to as the Greek Dark Ages.