Isthmian Games
From BiblePortal Wikipedia
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [1]
one of the great national festivals among the ancient Greeks, which derived its name from the isthmus of Corinth, where they were celebrated. They were held every third year, in honor of Poseidon, or, as some allege, every fifth year. (See Games).
The Nuttall Encyclopedia [2]
One of the four Pan-Hellenic festivals; they were periodically celebrated in honour of Poseidon or Neptune at the isthmus of Corinth, in Greece, whence the name.
