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Polyi'dus

2. Of Thessaly, a military engineer, who made improvements in the covered battering-ram (testudo arietaria) during Philip's siege of Byzantium, B. C. 340. His pupils were Diades and Chaereas, who served in the campaigns of Alexander. (Vitr. 10.19. s. 13.3, Schneider.)

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340 BC (1)
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