Long a minor player, after the defeat of its neighbor Mitanni by the Hittites, Assyria rises to the ranks of a major power under Ashur-uballit I. The period is marked by conflict with rivals Babylon and the Hittites as well as diplomatic exchanges with Egypt, in the Amarna letters. Note that after the excavation, in the late 19th and early 20th centuries, of various Neo-Assyrian documents, such as the Assyrian king list, scholars assumed that the chronological data for earlier Assyrian periods could be taken as accurate history. That view has changed over the years and the early Assyrian chronology is being re-assessed. Since there is yet no consensus, the traditional order and regnal lengths will be followed.