In the years after the Return of the Ñoldor to Middle-earth, it was one of the dwelling places of Celegorm and Curufin up to FA 455 when it was overrun by the forces of Morgoth during the Dagor Bragollach. The area was destroyed along with the rest of the Beleriand at the end of the First Age following the War of Wrath.
Aglon literally means "narrow path" in Elvish, but was actually taken to mean "pass between high walls" at the time.
|Elven Realms of Middle-earth throughout the Ages|
|Years of the Trees:||Cuiviénen | Eglador | Havens of the Falas|
|First Age:||Doriath | Dorthonion | Gondolin | Havens of Sirion | Havens of the Falas | Himlad & Pass of Aglon | Hithlum | Maglor's Gap | March of Maedhros | Nargothrond | Nevrast | Ossiriand | Pass of Sirion | Thargelion|
|Second Age:||Eregion | Greenwood the Great | Lindon | Rivendell|
|Third Age:||Lindon | Lothlórien | Northern Mirkwood | Rivendell|
|Fourth Age:||Lindon | Lothlórien & East Lórien | Rivendell | Wood of Greenleaves|