Cynosarges

Cynosarges (Greek: Κυνόσαργες Kynosarges) was a public gymnasium located just outside the walls of Ancient Athens on the southern bank of the Ilissos river. Its exact location is unknown but it is generally located in what is now the southern suburbs of Athens.

Its name was a mystery to the ancients that was explained by a story about a white or swift dog, etymologising the name as Kynos argos, from genitive of kyon (dog) and argos (white, shining or swift). The legend goes that on one occasion when Didymos, an Athenian, was performing a lavish sacrifice, a white (or swift) dog appeared and snatched the offering; Didymos was alarmed, but received an oracular message saying that he should establish a temple to Heracles in the place where the dog dropped the offering.

Herodotus mentions a shrine there in 490/89 BC, and it became a famous sanctuary of Heracles which was also associated with his mother Alcmena, his wife Hebe and his helper Iolaus. A renowned gymnasium was built there; it was meant especially for nothoi, illegitimate children. The Cynosarges was also where the Cynic Antisthenes was said to have lectured, a fact which was offered as one explanation as to how the sect got the name of Cynics.

...
Wikipedia