Regarding the Dunlendings:
Quote:
. . . many of the forest-dwellers of the shorelands south of the Ered Luin, especially in Minhiriath, were as later historians recognized the kin of the Folk of Haleth; but they became bitter enemies of the Numenoreans, because of their ruthless treatment and their devastation of the forests, and this hatred remained unappeased in their descendants, causing them to join with the enemies of Numenor. In the Third Age their survivors were the people known in Rohan as the Dunlendings ("Of Dwarves and Men", HoMe XII).
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So they are neither barbarians nor Numenoreans, but descendants of those of the second house of the Edain who did not go to Numenor.