Fornost

[Yrobryn]

Fornost was a city of Eriador in the north of Middle-earth. It was located at the south end of the North Downs, about 100 Númenórean miles north of Bree; after Fornost Erain was abandoned, the site became known as Deadman's Dike, visited only by Rangers. At the time when The Lord of The Rings is set, Fornost had been abandoned for "nearly a thousand years, and even the ruins of Kings' Norbury were covered with grass".
It is not known when Fornost was founded or when the kings of Arnor moved there from Annúminas, but it is known that the kings moved to Fornost some time around T.A. 861, when King Eärendur died, and Arnor was divided into three kingdoms with Fornost the capital of the greatest kingdom, Arthedain.