Oropher - Of the Elves which never crossed the Misty Mountains (the Nandor), some of them traveled north and settled in the Woodland Realm.

"The Elvish folk of this realm had migrated from the south, being the kin and neighbors of the Elves of Lórien; but they had dwelt in Greenwood the Great east of Anduin.  In the Second Age their king, Oropher [the father of Thranduil, father of Legolas], had withdrawn norhtward beyond the Gladden Fields.  This he did to be free from the power and encroachments of the Dwarves of Moria." ~Unfinished Tales, Appendix B (The Sindarin Princes of the Silvan Elves)