A fuller name of Fornost translated “Norbury of the Kings” (LotR/993), a combination of the city name with erain, plural of aran “king”.
Sindarin
fornost
place name. Norbury, (lit.) Northern Fortress
fornost erain
masculine name. Norbury of the Kings
Fornost Erain
noun. North(ern) fortress of the kings
forn (“right, north”) + ost (“fortress, stronghold”), erain (pl. of aran “king”)
Fornost Erain
Fornost Erain
Fornost Erain is Sindarin. It means "Northern Fortress (of the) Kings"; from forn "north" and ost "fortress", and erain is the plural of aran. The Fornost component is a direct cognate to Quenya Formenos. It was translated as "Norbury of the Kings" (from supposedly Old English norð-burg), which represents its Westron name.
The old capital of Arnor, translated “Norbury” (LotR/9). It is a compound of forn “north” and ost “city, fortress” (SA/formen, os(t)).
Conceptual Development: In Lord of the Rings drafts from the 1940s, this name first appeared as N. Osforod “Northburg” (TI/120), later revised to N. Fornobel (TI/147) and finally Fornost (WR/76).