Darius I

Upon seizing the throne, Darius I suppressed widespread revolts across the empire, including in Babylon, Media, and Egypt. He recorded these victories on the Behistun Inscription, which also legitimized his rule.

Darius I divided the Persian Empire into 20 provinces called satrapies, each governed by a satrap. He standardized coinage, weights, measures, and established a postal system, creating an efficient administrative structure.

Darius I began construction of Persepolis as the ceremonial capital of the Persian Empire. The city featured grand palaces and reliefs depicting tribute bearers from across the empire, symbolizing Achaemenid power.

Darius I built the Royal Road from Susa to Sardis, spanning 2,700 km. The road facilitated rapid communication and trade across the empire, with relay stations allowing messengers to travel in days.

Darius I launched a punitive expedition against Greece, resulting in the Battle of Marathon. The Persian army was defeated by the Athenians, marking the first major Greek victory in the Greco-Persian Wars.