The idiom signifying impossibility, often expressed as an event occurring “when pigs fly,” lacks a definitively traceable origin to a single source. However, textual evidence suggests that the concept of pigs flying as an absurdity existed long before its widespread modern usage. Variations of the sentiment conveying incredulity were present in earlier literature and common parlance.
While a direct pinpointing of the expression’s inception remains elusive, historical research points to Ben Jonson, a prominent English playwright and poet of the late 16th and early 17th centuries, as an early adopter, if not originator, of similar phrasing. Though not explicitly the modern idiom, Jonsons work employed imagery of unnatural or impossible occurrences, potentially contributing to the evolution of the phrase and its subsequent adoption into popular culture. The significance rests on Jonsons influence and the prevalence of such imagery in his era, laying the groundwork for the later articulation of the impossibility idiom.