Formenos

Formenos was the mighty stronghold of Fëanor, his sons, and their followers in the north of Valinor, built after his banishment from Tirion. A great number of the Noldor, including their king Finwë, went with Fëanor into exile.

Fëanor's treasury was in Formenos, and Melkor came to the stronghold searching for the Silmarils. Here he slew Finwë before stealing the Jewels and escaping to Middle-earth.