This coin comes from Karthaea on the island of Keos ,Cyclades 3rd century BC.On the obverse the head of Apollo is shown crowned with a laurel wreath.On the reverse a dog is depicted with rays emanating from its head,representing the Dog Star. The legend reads ΚΑΡΘΑΣΑ. The images depicted are associated with an ancient local cult that sacrificed to Zeus and to the Dog Star so that the Etesian winds might blow, bring cooler weather, and ward off disease
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