What happened on this land around c. 1000 BCE (Iron Age)?

Rise of Iranian-speaking polities (Medes), decreased Assyrian dominance, gradual consolidation of Iranian highland polities.
Rulers
Neo-Assyrian influence (northwest)
c. 900–600 BCE
Assyrian power projects west of the Zagros; affects western Iranian lands.
Local Iranian tribes / early Medes
c. 900–600 BCE
Emergence of Median polities and other Iranian tribal confederations in the plateau.
Battles
Fall of Nineveh / decline of Assyria
c. 612 BCE
Assyrian collapse alters regional power balance, opening space for Median ascendancy.