Augeas

Hercules cleaned his stables.

Stables. Really big ones.

King Augeas of Elis.

Heracles was to have the tenth part of the oxen as his reward, but when the hero had accomplished his task by leading the rivers Alpheus and Peneus through the stables, Augeas refused to keep his promise. Heracles, therefore, made war upon him, which terminated in his death and that of his sons, with the exception of one, Phyleus, whom Heracles placed on the throne of his father.