This might sound strangely familiar....
In actual fact, the origins of the Dorians are necessarily obscure, but it appears they originated in northern and northwestern Greece—i.e., Macedonia and Epirus. From there they apparently swept southward into central Greece and then into the southern Aegean area in successive migrations beginning about 1100 bce, at the end of the Bronze Age. The invading Dorians had a relatively low cultural level, and their only major technological innovation was the iron slashing sword. The Dorians swept away the last of the declining Mycenaean and Minoan civilizations of southern Greece and plunged the region into a dark age out of which the Greek city-states began to emerge almost three centuries later.
Uncouth invaders from somewhere unknown oop North starting a Dark Age?
Gor blimey, not more Vikings and Saxons?
Doric was one of the major dialects of the Classical Greek language, along with the Ionic-Attic, Aeolic, and Arcado-Cypriot dialect groups. But because the Ionic-Attic dialect of Athens dominated Greek culture from the 5th century bce, very little remains of ancient writings in pure Doric dialect.
Received pronunciation from the couth capital Athens squeezes out the regional dialect of the Dorics in the sticks? Or they hadn't learned to read and write proper like what the Athenians did.
Politically, the Dorian centres took two different courses of development. In Corinth, Rhodes, Argos, and various other mercantile-oriented city-states, the Dorian invaders, though at first reserving political power unto themselves, eventually merged with the conquered indigenous peoples of their regions. In Sparta and the island of Crete, by contrast, the Dorians kept power to themselves and constituted themselves into a ruling military class. These militarized Dorian aristocracies deliberately “froze” an archaic form of society (and sacrificed most of their cultural and artistic promise in the process) in order to maintain dominance over a larger population of serfs.
https://www.britannica.com/topic/DorianDorians --> Spartans?
Just in time to suicide themselves at Thermopylae?
https://en.wikipedia.org/wiki/Battle_of_ThermopylaeFighting in the shade.