The Stanford Encyclopedia of Philosophy's Fatalism entry traces a precursor thought to Aristotle's De Interpretatione (Aristotle died 322 B.C.E.) but dates the named Idle Argument itself only by when the Stoic Chrysippus (c280-c206 B.C.E.) replied to it, a reply date rather than a founding date; no source found names who first posed the complete argument or in what year, so this atlas records no origin-year fact rather than assign a false precise date.
What would resolve this A specialist source identifying who first posed the Idle Argument in its complete constructive-dilemma form, distinct from Aristotle's earlier, less formal remark and from Chrysippus's later reply to it.
OpenHistory of philosophy (dating attribution)Fatalism (Stanford Encyclopedia of Philosophy)