The Biton reference article from the English Wikipedia on 24-Apr-2004
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Biton

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In Greek mythology, Biton was the son of Cydippe and brother of Cleobis.

Cydippe, a priestess of Hera, was on her way to a festival in the goddess' honor. The oxen which were to pull her cart were overdue and her sons, Biton and Cleobis pulled the cart the entire way (45 stadia; 8 km). Cydippe was impressed with their devotion to her and her goddess and asked Hera to give her children the best gift a god could give a person. Hera ordained that the brothers would die in their sleep.