5 - Clean the Augean stables in one day - 12 Hercules´ works (sitios de interés)
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The fifth task set to Herakles was to clean the Augean stables in a single day. The reasoning behind this being set was twofold: firstly, all the previous labours only exalted Herakles in eyes of the people so this one would surely degrade him; secondly, the amount of dirt amassed in the uncleaned stable made the task surely impossible. However, Herakles succeeded by rerouting the rivers Alpheus and Peneus to wash the filth out.Augeas (or Augeias) was King of Elis.
http://en.wikipedia.org/wiki/Augeas