Mentioned in the 1st century AD in an unknown writers travel guide,Periplus of the Ertythraean Sea(Shores of the Indian Ocean).
"And then, after sailing four hundred stadia along a promontory, toward which place the current also draws you, there is another market-town called Opone, into which the same things are imported as those already mentioned, and in it the greatest quantity of cinnamon is produced, (the arebo and moto), and slaves of the better sort, which are brought to Egypt in increasing numbers; and a great quantity of tortoiseshell, better than that found elsewhere".
en.wikipedia.org/wiki/Periplus_of_the_Erythraean_Sea
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