FornostFornost - After the break-up of Arnor into successor states, the capital of Annúminas was abandoned and the northern stronghold of Fornost became the capital of the new state of Arthedain and the central city of Men in northern Middle Earth.

 

"The Kings of Arthedain maintained a special warden at Amon Sûl whose stone was held in the chief of the Northern palantíri being the largest and most powerful and the one through which communication with Gondor was mainly conducted.  After the destruction of Amon Sûl by Angmar in 1409 both Stones were placed at Fornost, where the King of Arthedain dwelt." ~Unfinished Tales (The Palantíri)