Which Greek hero cleaned the Augean stables in a single day?

Which Greek hero cleaned the Augean stables in a single day? Heracles completed the task in a single day.

The Augean stables belonged to King Augeas of Elis and housed an enormous herd of cattle. They had reportedly gone uncleaned for decades, making the assignment seem both humiliating and impossible. Heracles solved it through engineering rather than by shovelling manure.

He dug channels and diverted the rivers Alpheus and Peneus through the stable compound. The rushing water swept away the accumulated filth, allowing him to finish within one day. In some traditions, Augeas had promised Heracles one-tenth of the cattle as payment, but later refused to honour the agreement.

This was counted as Heracles’s fifth Labour in the commonly cited order. Eurystheus later rejected it, arguing that the rivers had done the work and that Heracles had accepted payment. That rejection helped expand the original set of ten tasks into the familiar Twelve Labours. Iolaus belongs to the Hydra story, not this cleaning feat.