For many years since the Nirnaeth Arnoediad, he sought Turgon and the Kingdom of Gondolin but was unable to find it and had also been wandering with his companion Gelmir since the Dagor Bragollach. In recent years they had been living with Círdan at the Havens of Sirion, and were afterwards sent by him on an errand to Nargothrond bearing a warning from Ulmo, of the impending doom of the hidden realm.
Before arriving there, they encountered Tuor at Annon-in-Gelydh as he was about to leave Hithlum. When they arrived in Nargothrond, he and Gelmir counseled Orodreth to shut the doors of his realm and remain a hidden folk, but Orodreth under the influence of Túrin did not listen to their advice.
Arminas was a Sindarin word for 'Royal Tower'.