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"The Nemian and Isthmian games occurred more frequently than the Olympic and Pythian. They were celebrated once in two years, the Nemian in the valley of Nemea between Phlius and Cleonae, and the Isthmian by the Corinthians, on their isthmus, in honour of Poseidon (Neptune)." — Smith, 1882

Isthmian crowns

"The Nemian and Isthmian games occurred more frequently than the Olympic and Pythian. They were celebrated…