Who are the only people the Persian kings did not defeat and conquer?

Name: Who are the only people the Persian kings did not defeat and conquer?
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The Persian kings, despite their vast empire and numerous conquests, were unable to defeat and conquer the Scythians. The Scythians were a group of Iranian nomads known for their skills in warfare and their ability to move quickly across the vast steppes of Eurasia, which made them difficult for the Persians to subdue.

Who Are the Only People the Persian Kings Did Not