Dark Age (s) .This term is applied to various turbulent periods of history when civilization was endangered and few records handed down. In the ancient world it refers to the following two periods.1. In Greece, the period from, very roughly, the twelfth to the ninth century BC. It begins with the invasions that resulted in the final destruction of Mycenae and ends with the emergence of Athens as a cultural force in Greece.
2. In the later Roman empire, the period of the barbarian invasions and their aftermath, very roughly from the sixth to the ninth century AD.