hi bert, where do these examples come from? it's a bit tricky to guess the meanings without context, and without things like the articles. but i think
1. 'a story/legend is a curer of pain to men ', e.g. listening to the iliad; or it might mean something like 'a doctor of sadness is esteemed among men', although i doubt it (but see the LSJ defn of lo/goj, section I.4);
2. i think the genitive here is genitive of quality following the predicate, i.e. ou(=toj ga\r mo/noj e)/xei qelkth/ria yuxh=j 'for this alone has "charms" of soul'; i think that the predicate is idiomatic, roughly like our idiomatic 'lifts the spirit', i.e. 'for this alone lifts the spirit': see the way qelkth/ria is followed by a genitive plural "toils" in aeschylus, to means "lightens toils", as quoted in lsj:
http://www.perseus.tufts.edu/cgi-bin/pt ... 3D%2348082
3. i looked through the different meanings of le/gw, but without a 2nd accusative, none of them leapt out as being a good fit here... i agree with you, it's unclear... it might mean something like 'the most-wise ancients call him', but there are better ways to say this, so i doubt it... i'm probably missing something though
4. i think this is saying 'a pleasant medicine is also effective/useful', although it looks like it's in the indirect for some reason, i.e. (they say) a)stei=on fa/rmakon kai\ xrh/simon ei)=nai, with kai\ as 'also'.
sorry i couldn't help u further...