Period during which the powerful Assyrian state emerged and gained independence under Ashur-uballit I (1365-1330 BCE). The Assyrian state expanded its territory westward and southward during the reign of Adad-nirari I (1307-1275 BCE), a process completed when Tukulti-Ninurta I (1244-1208 BCE) captured Babylon. After his death, Assyria was plunged into a crisis and only recovered in the late 12th century under Tiglath-Pileser I (1114-1076 BCE). Repeated clashes with the Aramaeans caused Assyria to lose the territories it had conquered at the end of the 2nd millennium.