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During the 428 BCE Olympic Games Alkibiades among others was poisoned at a banquet. As his friend, the Spartan misthios Kassandra investigated and learned that the man behind the deed as well as the antidote were located within the fort. She infiltrated the fort, killing its polemarch and captains, burning the supplies within and claiming valuables, as well as finding the antidote in time.
- The fort's name references Koroibos of Elis, the first recorded Olympic champion.