
one of the leading Athenian poets of the vigorous and satirical Old Comedy, and a rival of Aristophanes.
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http://www.britannica.com/eb/a-z/e/52

(c. 445-c. 411 BC) Greek comic dramatist. He was a contemporary and rival of
Aristophanes, with whom he helped create the Old Comedy form. He is ranked by Horace as one of the greatest writers of his school. His...
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http://www.encyclo.co.uk/local/20688

Eupolis was an Athenian comic poet, who lived about 429 BC. Neither the date of his birth nor that of his death is known with certainty. He belongs, like Aristophanes and Cratinus, to the Old Comedy. His works are all lost except small fragments.
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http://www.probertencyclopaedia.com/browse/CXEA.HTM
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