Prince Imrahil's elven descent

[Gwaihir the Windlord]

The Nandor were Eldar, as were all you began the march whether they finished it or not.

(Of the Silvan Elves, who were Nandor) They dwindled and became a rude and rustic people, hardly to be distinguished from Avari; yet they remembered in their hearts that they were indeed in origin Eldar...'

They again increased in wisdom when the Beleriandic Elves came among them.