Depictions of the kausia can be found on a variety of coins and statues found from the Mediterranean to the Greco-Bactrian kingdom and the Indo-Greeks in northwestern India. The Persians referred to both the Greeks and Macedonians as "Yauna" (Ionians), but made a distinction between "Yauna by the sea" and those "with hats that look like shields" (yauna takabara), probably referring to the Macedonian kausia hat. According to Bonnie Kingsley the kausia may have came to the Mediterranean as a campaign hat worn by Alexander and veterans of his campaigns in India but according to Ernst Fredricksmeyer the kausia was too established a staple of the Macedonian wardrobe for it to have been imported from Asia to Macedonia.
^Roisman, Joseph; Worthington, Ian (2010). A Companion to Ancient Macedonia. John Wiley and Sons. ISBN1-4051-7936-8, p.87
^Kingsley, Bonnie M (1981). ""The Cap That Survived Alexander."". American Journal of Archaeology. 85: 39.
^Fredricksmeyer, Ernst (1986). "Alexander the Great and the Macedonian kausia". Transactions and Proceedings of the American Philological Association. 116: 215–227.
^Ian Worthington, Nicholas Geoffrey Lemprière Hammond, Ventures into Greek history, p. 135, Clarendon Press, 1994
^Olga Palagia (2000). "Hephaestion’s Pyre and the Royal Hunt of Alexander," in A.B. Bosworth and E.J. Baynham (eds), Alexander the Great in Fact and Fiction. Oxford & New York: Oxford University Press. ISBN9780198152873, p. 185.