Póros (pô´rôs), anc. Greek Calauria, island (1991 pop. 3,570), c.8 sq mi (20 sq km), SE Greece, in the Aegean Sea near the Argolis peninsula of the Peloponnesus. It is famous for its fine marble. There are remains of a temple of Poseidon where Demosthenes took poison and died in 322 BC Representatives of Britain, France, and Russia met on Póros in 1828 to discuss the future of the new Greek state.
"Póros." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (September 19, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/poros
"Póros." The Columbia Encyclopedia, 6th ed.. . Retrieved September 19, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/poros