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Boubakes (Bubaces). A faithful eunuch who remained with Darius III to the end of the King's life. He appears to have acted as an interpreter (C 5.11.4).
Search: Who's Who in the Age of Alexander the Great: Prosopography of Alexander's Empire by Waldemar Heckel
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The name "Boubakes" was used in the countries of the Middle East, Algeria, Yemen, Egypt, etc. So, I decided that perhaps he was from this area.