Aspects of this topic are discussed in the following places at Britannica.
...consisted of three classes: the warriors or aristocracy, the priests, and the farmers or herdsmen. Crosscutting these divisions was a tribal structure based on patrilineal descent. The title king of kings, used even in the 20th century by the shahs of Iran, implies that the central authority exercised power through a pyramidal structure that was controlled at levels below the...
in Iran, ancient: The organization and achievement of the Achaemenian Empire )At the centre of the empire sat the king of kings. Around him was gathered a court composed of powerful hereditary landholders, the upper echelons of the army, the harem, religious functionaries, and the bureaucracy that administered the whole. This court lived mainly in Susa but went in the hot summer months to Ecbatana (modern Hamadān), probably in the spring to Persepolis in...
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