Shelob

The earliest definite date we have for Shelob is c.1000 (Second Age), because we know that she occupied Cirith Ungol 'before the first stone of Barad-dûr' which was laid at about that time (from The Two Towers IV 9 Shelob's Lair). We also know, from the same source, that she originally came there 'flying from ruin' - this is indefinite, but ties in neatly with the War of Wrath a thousand years earlier. The suggestion here is that she originally occupied Beleriand, probably in the Ered Gorgoroth, and fled southwards to escape its destruction.

If 'Shelob' were an Elvish name, the 'e' sound would be short, giving a pronunciation something like 'shehlob'. Her name, though, is a compound of two English words, 'She-lob', so we have assumed a standard English pronunciation.