This, however, ignores the fact that monarchs in the Amarna letters frequently refer to predecessors as their "father," even if they were not their biological sons.

In this case, Ashur-uballit presumably referred to Ashur-nadin-ahhe because the latter, unlike Eriba-Adad I, had previously corresponded with the Egyptian court.

With Assyrian power firmly established, Ashur-uballit started to make contacts with other great nations.

His messages to the Egyptians angered his Babylonian neighbour Burnaburiash II, who himself wrote to the Pharaoh: “with regard to my Assyrian vassals, it was not I who sent them to you.

[3] Ashur-uballit I then counterattacked, and invaded Babylonia, appropriating hitherto Babylonian territory in central Mesopotamia, and forcing a treaty in Assyria's favour upon Kurigalzu.