How did ancient Greeks worship Poseidon?

In ancient Greek religion, Poseidon, the god of the sea, earthquakes, and horses, was worshipped through various rites and festivals. As one of the 12 Olympians, his worship was widespread. Horses were particularly sacred to him, and he was honored at the Isthmian Games, which followed the pattern of the Olympic Games held in honor of Zeus. Sacrifices, a principal proof of piety, were offered to the Olympian deities, with different animals sacred to different gods. Horses were associated with Poseidon, and bulls were offered to Zeus and Dionysus. Prayers to deities like Poseidon typically began with compliments, followed by references to the petitioner's piety, and concluded with a plea.12