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Tome of the Daedric Portals - by the Sinistral Apprentice..
Sinestral is just a word meaning left-side. It's where we get the word sinister from. It might be the elves, but it could just be the typical use of the word.
Would this be the only lore that mentions Lefthandedness I think in connection to these lefthanded Elves - this unearthed Lefthander Aegis Belt crafted using the five pieces found and their meanings in the Codex of them.