Proper noun
Argolid (often "the Argolid")
A regional unit in eastern Peloponnese, Greece, which has its modern capital at Nafplio. Its original capital was at Argos.
Synonyms: Argolis, Argolida
When Heracles brought back the man-eating Mares of Diomedes successfully, Eurystheus dedicated the horses to Hera and allowed them to roam freely in the Argolid. Source: Internet