The Mannaean kingdom began to flourish around 850 BC. The Mannaeans were mainly a settled people, practicing irrigation and breeding cattle and horses. The capital was a fortified city called
Izirtu (
Zirta). By the 820s BC, Manneaea had expanded to become a large state. By this time they had a prominent aristocracy as a ruling class, which somewhat limited the power of the king. Beginning around 800 BC, the region became contested ground between
Urartu, which built several forts on the territory of Mannaea, and
Assyria. In the mid-8th century BC, during the open conflict between the Assyrians and the Urartians, Mannaea seized the opportunity to enlarge its holdings. The Mannaean kingdom reached the height of its power during the reign of
Iranzu (c. 725–720 BC). In 716 BC, king
Sargon II of Assyria moved against Mannaea, where the ruler of Mannaea, Aza, the son of Iranzu, had been deposed by Ullusunu with the help of the Urartians. Sargon took Izirtu, and stationed troops in
Parsua (Parsua was distinct from Parsumash located further southeast in what is today known as Fars province in Iran.). The Assyrians thereafter used the area to breed, train and trade horses. According to one Assyrian inscription, the
Cimmerians (
Gimirru) originally went forth from their homeland of
Gamir or
Uishdish in "the midst of Mannai" around this time. The Cimmerians first appear in the annals in the year 714 BC, when they apparently helped the Assyrians to defeat Urartu. Urartu chose to submit to the Assyrians, and together the two defeated the Cimmerians and thus kept them out of the
Fertile Crescent. The Cimmerians again rebelled against Sargon by 705 BC, and he was killed while driving them out. By 679 BC the Cimmierians migrated to the east and west of Mannaea. The Mannaeans are recorded as rebelling against
Esarhaddon of Assyria in 676 BC, when they attempted to interrupt the horse trade between Assyria and its colony of Parsua. The Mannaean king Ahsheri, who ruled until the 650s BC, continued to enlarge the territory of Mannaea, although paying tribute to Assyria. However, Mannaea suffered a crushing defeat at the hands of the Assyrians around 660 BC, and subsequently an internal revolt broke out, continuing until Ahsheri's death. Also in the 7th century BC, Mannaea was defeated by the advancing
Scythians, who had already raided Urartu and been repelled by the Assyrians. This defeat contributed to the further break-up of the Mannaean kingdom. Ahsheri's successor, Ualli, as an ally of Assyria, took the side of the Assyrians against the
Medes (
Madai), who were at this point still based to the east along the southwest shore of the
Caspian Sea and revolting against Assyrian domination. The Medes subjugated by Assyria. However, the
Neo-Assyrian Empire, which had dominated the region for three hundred years, began to unravel, consumed by civil war after the death of
Ashurbanipal in 627 BC. The upheavals in Assyria allowed the Medes to free themselves from Assyrian vassalage and make themselves the major power in Iran. At the battle of Qablin in 616 BC, the Assyrian and Mannaean forces were defeated by
Nabopolassar's troops. This defeat laid open the frontiers of Mannaea, which fell under the control of Media between 615 BC and 611 BC. ==Archaeology==