QuoteI think Joshua mentions he thinks that DeWitt indicates Menoeceus might have been written first, but the main reason I am posting this is that we probably ought to check that in case we need to have a correction to the sequence here in this thread.
I actually cannot find my copy of DeWitt right now, but Wikipedia cites page 9:
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Epicurus's Letter to Menoeceus, possibly an early work of his, is written in an eloquent style similar to that of the Athenian rhetorician Isocrates (436–338 BC), but, for his later works, he seems to have adopted the bald, intellectual style of the mathematician Euclid.