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And what was the ethnicity of Bagoas? As I know, there were many different people's and tribes, that populates Achaemenian Empire. And also there was extended slave trade with foreign nations.
There is no way to know because there are no records of his birthdate.
Bagoas was Persian as the name is of Persian origin. He was, to quote Curtius, "in the very flower of his youth" when he first met Alexander. That seems to me to be 16-18 years old.
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