In 
J. R. R. Tolkien's fictional 
Middle-earth, the 
Elves  are a sundered people.  They awoke at 
Cuivienen on the continent of Middle-earth, but some time after that, they split into two groups, which were never fully reunited.
The Sundering is as follows:
-  QUENDI (the Elves)
-  The Avari are Those who Refused the Summons of Oromë, or simply The Unwilling.  Together with the Nandor and the Sindar, they are called the Moriquendi[?], in recognition of the fact that they did not see the light of the Two Trees.  While all of the Eldar departed Middle-earth by the early Fourth Age, it appears that the Avari stayed.
 -  The Eldar are those who accepted the summons.  Their name, literally Star People, was given to them by Oromë.  They comprise three tribes: the Vanyar, the Noldor, and part of the Teleri.
-  Those of the Teleri who refused to cross the Misty Mountains, and stayed in the valley of Anduin, are called the Nandor (Valley People).
-  Those of the Nandor who left the Anduin under the leadership of Denethor and came to Beleriand are called the Laiquendi[?] (Green Elves).
 
 -  Those of the Teleri who came to the shores of Belegaer but decided to stay there are called the Sindar (Grey People or Grey Elves).
 -  The Noldor, the Vanyar, and those of the Teleri who stayed with them to the end are called the Calaquendi.
-  Some of the Noldor returned with Fëanor to Middle-earth, and at least some of these remained there through the Third Age.
 
 
 
 
 
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