this is very well in itself -- the woodland elf corrupted by the lure of golden splendour , but it need not be remarked again how strangely at variance is this picture with that of thingol lord of beleriand , who had a vast treasury in his marvellous underground realm of menegroth , the thousand caves -- itself largely contrived by the dwarves of belegost in the distant past ( ? he silmarillion pp .