Alcaeus, the archaic lyric poet, mentions Sisyphus' great toil in Acheron.
Though fragmentary, the passage identifies Sisyphus as a king and son of Aeolus, whose conflict with Zeus (king Cronides) has resulted in his "affliction beneat the black earth." (9-10)


(38A) πῶνε [.......] Μελάνιππ’ ἄμ’ ἔμοι. τι[..].[
⸏†ὄταμε[...] διννάεντ’ Ἀχέροντα μεγ̣[
ζάβαι[ς ἀ]ελίω κόθαρον φάος [
⸏ὄψεσθ’, ἀλλ’ ἄγι μὴ μεγάλων ἐπ[
καὶ γὰρ Σίσυφος Αἰολίδαις βασίλευς [ (5)
⸏ἄνδρων πλεῖστα νοησάμενος [
ἀλλὰ καὶ πολύιδρις ἔων ὐπὰ κᾶρι [
⸏δ̣ιννάεντ’ Ἀχέροντ’ ἐπέραισε, μ[
α]ὔτω<ι> μόχθον ἔχην Κρονίδαις βα̣[σίλευς κάτω*
⸏] μ̣ελαίνας χθόνος. ἀλλ’ ἄγ̣ι μὴ τα[ (10)
´̣].ταβάσομεν αἴ ποτα κἄλλοτα. [


This passage is cited in , from:
E. Lobel and D.L. Page, Poetarum Lesbiorum fragmenta, Oxford: Clarendon Press, 1955 (repr. 1968 (1st edn. corr.)): 112-116, 118-176, 178-206, 208-286, 290.
Retrieved from: http://stephanus.tlg.uci.edu/Iris/Cite?0383:001:6063

*Line 9 is thus augmented by Denys Page in Sappho and Alcaeus