structural:expansion, structural:scholar_edition, structural:reformatting, information:classification
Central authority and semi-autonomous kings

Compared with the earlier Achaemenid Empire, the Parthian government was notably decentralized. An indigenous historical source reveals that territories overseen by the central government were organized in a similar manner to the Seleucid Empire. They both had a threefold division for their provincial hierarchies: the Parthian marzbān, xšatrap, and dizpat, similar to the Seleucid satrapy, eparchy, and hyparchy. The Parthian Empire also contained several subordinate semi-autonomous kingdoms, including the states of Caucasian Iberia, Armenia, Atropatene, Gordyene, Adiabene, Edessa, Hatra, Mesene, Elymais, and Persis. The state rulers governed their own territories and minted their own coinage distinct from the royal coinage produced at the imperial mints. This was not unlike the earlier Achaemenid Empire, which also had some city-states, and even distant satrapies who were semi-independent but "recognised the supremacy of the king, paid tribute and provided military support", according to Brosius. However, the satraps of Parthian times governed smaller territories, and perhaps had less prestige and influence than their Achaemenid predecessors. During the Seleucid period, the trend of local ruling dynasties with semi-autonomous rule, and sometimes outright rebellious rule, became commonplace, a fact reflected in the later Parthian style of governance.