(ancient Greece) leader of a group or festival; leader of a chorus WordNet 3.0 & Open English WordNet

In the theatre of ancient Greece, the choregos was a wealthy Athenian citizen who assumed the public duty, or choregiai, of financing the preparation for the chorus and other aspects of dramatic production that were not paid for by the government of the polis or city-state. Wikipedia

sponsor of a theatrical production in Ancient Greece Wikidata

A chorus leader, especially one who provided at his own expense and under his own supervision one of the choruses for the musical contests at Athens. Wiktionary