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Factional Politics: The Ostracism of Themistokles A group of ostraka found together in a pit on the North Slope of the Acropolis is of special interest. There were 190 ostraka, mostly the round feet of ... There were 190 ostraka, mostly the round feet of drinking cups, all inscribed with the name of Themistokles son of Neokles, of the deme Phrearrhios, the far-sighted architect of Athenian naval power.