I believe the predecessors of the Rohirrim originally were the peoples of Rhovannion (from whom the kinstrife eventually arose when Valacar married the daughter of the King of Rhovannion).
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...they were the nearest in kin of lesser Men to the Dunedain (being for the most part descendants of those peoples from whom the Edain of old had come); and they gave them wide lands beyond Anduin south of Greenwood the Great, to be a defence against men of the east.
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When eventually driven out of Rhovannion by the Wainriders they moved east
of the Anduin and then north past the Carrock, until Eorl the Young helped out
Gondor. Of course, during the Kinstrife they assisted Eldacar against Castimir.
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Eldacar eluded his enemies, and came to the North, to his kinsfolk in Rhovanion. Many gathered to him there, both of the Northmen in the service of Gondor, and of the Dunedain of the northern parts of the realm. For many of the latter had learned to esteem him, and many more came to hate his usurper.
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(appendix)