Arvandor

The Arvandor were a people of eastern Eriador in the second Age.They were tall, dark haired and grey-eyed and possibly related to the Edain of the house of Beor.

When Annatar came to Eriador he visited the Arvandor and started to lure some of them to form a dark cult.The Priest-Queen Blogath made herself Ruler of the Arvandor and delved a deep temple as her main seat of power within the Trollshaws.When the Númenóreans started to visit Middle-Earth and made contacts with the Eriadorians they fought the Dark Priests of Rhudaur.The Arvandor rose up against their rulers and buried Blogath and some of her followers within her own halls in the Yfelwyd, doomed to become accursed Bloodwights.

The later fate of the Arvandor is unknown.They might have contributed to the later populance of Rhudaur and Angmar, maybe intermixing with the Ne Dreubhan and Borians.

speculations
The Gauredain might be late descendants of Arvandor who were driven out of Eriador to the northern Wastes.