What form of government did Persia have?

Persia, particularly during the Achaemenid Empire (c. 550-330 BCE), was an absolute monarchy where the king held supreme power. The monarch, known as the Shahanshah (King of Kings), ruled over a vast and diverse empire, implementing a centralized administration and local governance through satraps (provincial governors). This system allowed for a degree of local autonomy while maintaining loyalty to the central authority. Over time, the form of government in Persia evolved with different dynasties, but monarchy remained a constant feature.