In the works of J. R. R. Tolkien, the fictional Sindar (meaning Grey People, singular Sinda, although the latter term was not generally used by Tolkien) are Elves of Telerin descent. They are also known as the Grey Elves. Their language is Sindarin. The King of Doriath, Elu Thingol (Elwë) was the King of the Sindar.
The Sindar were happy in Middle-earth, but once the desire for the Sea was aroused in them, they could not be content until they sailed to Eldamar. Although less learned and powerful than the Calaquendi and less interested in crafts than the Noldor, they were extremely gifted in music, and their voices were very fair.
The Sindar are "grey" perhaps because they were not Elves of the Light, never having actually set foot in Valinor, but neither were they Avari, since they did accept the invitation and set out on the journey (and therefore were technically counted among the Eldar). They are sometimes referred to as Elves of the Twilight. The term grey may also refer to Elu Thingol's grey cloak. The term Sindar is actually not Sindarin in origin: it is the Quenya name devised by the Noldorin exiles. It may also be related to Lindar, the Telerin name for themselves. The name that the Sindar used for themselves was simply Edhil ("Elves", singular Edhel). When the Teleri left for Aman, they called themselves the Eglath, the Forsaken Ones.
The Teleri were the greatest host of the Eldar. They had two kings, the brothers Elwë Singollo (or Elu Thingol as he was later known in the Sindarin tongue) and Olwë. When the Teleri reached Beleriand during the Great Journey from Cuiviénen, Thingol went wandering in the forests as was his wont. In the forest of Nan Elmoth he met Melian, one of the Maiar. They fell in love, and with Melian, Thingol stood spellbound in Nan Elmoth for several years.
In the meantime, Olwë and many of the Teleri could not delay longer, and went to Aman without Elwë and his following. Elwë's followers stayed in Beleriand, to search for their king. At long last he awoke from the spell and set up a kingdom in the midst of Beleriand: Eglador (Land of the Forsaken, or Land of the Elves. The etymology is not clear.). The Dwarves of Nogrod and Belegost in the Ered Luin (Blue Mountains) were contracted to aid in the building of the city of Menegroth (the Thousand Caves).
Other Teleri also stayed behind: these were the friends of Ossë the Maia, who had fallen in love with the shores of Middle-earth, and did not wish to depart. Their leader was Círdan, and they established cities at Eglarest and Brithombar. They were known as the Falathrim, or Elves of the Falas (Shore). They were not part of the realm of Eglador, but still took Thingol as their King.
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