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In the north part of the island
there are the ruins of Poseidon's Temple, which was built in 520BC. The
main Temple was built in Doric style, though some of its columns were
Ionian. Nearly the Temple there was the built up area of Kalavria.
Such was the place's importance that
it functioned as the center for the Amphictyonic League (amphictionnes:
dwellers around") a voluntary "cooperative" of city-states in both civic
and religious matters, which included Hermione, Epidauros, Aigina,
Prassies, Athens and Orhomenos
At the Poseidon's Temple came
Demosthenes the ancient great orator availing himself of its right of
sanctuary as Philip the King of Macedonia chased him.
Poros
played a significant role in 1821 Revolution. It was placed on the map of
history in 1828 where rival assemblies met to make important decisions,
which set the Constitution in a positive direction. In 1830 the building
of the shipyard and naval station at Poros began.

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