Conceptual Development: In the earliest Lost Tales, this name was as G. Angorodin (LT2/77). It was revised in the Lays of Beleriand from the 1920s, first to (singular) ᴱN. Aiglir Angrin and then to (plural) N. Eiglir Engrin (LB/49), forms that also appeared in the Silmarillion drafts from the 1930s (SM/220). In the mid-30s, the form N. Ered-engrin first appeared (LR/258), and The Etymologies from the same period, it already had the derivation given above (Ety/ÓROT).
ered engrinplace name. Iron Mountains