Yes, the Sabeans were semitic, the same ethnic group as the Israelites and the Phoenicians that inhabited the eastern Mediterranean seaboard. Carthage was a Phoenician colony.
Edit: come to think of it, the ancillary should be renamed a Semitic turncoat. Then again, although the Carthaginians and the Sabaeans were ethnically related, I doubt they had much in common when it came to politics and military, so a Carthaginian turncoat would not be much use against the Sabeans and vica versa.
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