The Poseidea is a relatively obscure festival from the ancient Attic calendar, held in honour of Poseidon, god of the sea, earthquakes, and horses. It took place in the lunar month called Poseideon (roughly late December into January). Although details are limited, the festival provides an intriguing insight into how the Athenians and other Greeks recognized the power of the sea and its perils — especially in winter. Date & Calendar Context The Attic month Poseideon is identi