The Twin Rivers of Mesopotamia, the Tigris and the Euphrates, were important factors in the development of the earliest communities in the Near East.
Irrigation ensured a highly productive agricultural lifestyle in the communities along the rivers, resulting in increased populations within the farming communities.
At around 3500 BCE, Uruk emerged as an advanced city, signaling the start of the Urban Revolution, which was the emergence of the various city-states from simple and agrarian communities within Mesopotamia.
After the fall of Ur to the Elamites, several rival kingdoms struggled for control over Mesopotamia
The most astounding of the structures of the city was the famous Ishtar Gate, which was richly decorated with blue-glazed bricks adorned with relief figures of lions and bulls. The gate was part of the inner walls of the city which led to the great Temple of Marduk, the chief god of Babylon, and the ziggurat.
Under the leadership of Cyrus, the Persians defeated Babylon in 539 BCE and Lydia in 546 BCE
The satraps were representatives of the king and ruled in his name, tasked with maintaining peace and order, overseeing bureaucracy, collecting tributes, and rendering final judgment
An official from the royal court, known as "the eye of the King," conducted regular inspections of the satrapies to ensure proper governance throughout the empire
Zoroastrianism was introduced during the reign of the Achaemenids, simplifying the pantheon of old gods and introducing the concept of two great opposing forces: Ahura Mazda and Angra Mainyu or Ahriman
Darius left behind the Behistun Inscription, a monumental account of his reign inscribed on a rock face of Mount Behistun in western Iran, written in cuneiform in three languages: Elamite, Babylonian, and Persian