what are 3 important facts about the dorians?

Answer 1

1) Dorians or Dorian Greeks (Greek: Δωριεῖς, Dōrieis, singular Δωριεύς, Dōrieus) were one of the ethnic populations into which the ancient Greeks considered themselves divided, the other three being the Achaeans, the Ionians and the Aeolians
2) Traditional accounts place their origins in the north, north-eastern regions of Greece, ancient Macedonia and Epirus, whence obscure circumstances drove them south into the Peloponnese, to certain Aegean islands, and to the coast of Asia Minor.
3) Late mythology gave them an eponymous founder, Dorus son of Hellen, the mythological patriarch of the Hellenes.

Other facts to chose from:
*There is such a thing as a Doric order of architecture.
*Dorian might be translated as "the country people", "the mountain people", "the uplanders", "the people of the woods" or some such appelation, which is eminently suitable to their reputed origin.