Keywords: ChalcidianThraceHelmets.jpg en Chalcidian type helmets worn by Thracians mid 4th century BC and older forms Own work data from; The Odrysian Kingdom of Thrace Orpheus Unmasked Oxford Monographs on Classical Archaeology by Z H Archibald 1998 ISBN-10-0198150474 own Megistias 2009-09-07 Ancient Greek bronzes Ancient Greek helmets Chalcidean helmets |