Sindarin developed from Old Sindarin (preserved only in some Doriathrin records), itself from Common Telerin under the shadow of Middle-earth and not in the holy light of the Two Trees of Valinor. The Kingdom of Doriath became an isolated land after the return of the evil Vala Melkor (as Morgoth) to his stronghold of Angband. So from that time it remained conservative, and later resisted the Noldorin influence almost entirely. Until then, owing to the nomadic life of the Grey Elves, their tongue had remained practically uniform, with one notable exception. In the North-West region of Beleriand there were settlements of Elves who seldom went far abroad. Their language, although generally of Sindarin kind in many linguistic aspects, early diverged from that of the other Sindar. It was usually called Mithrimin.