Ezra 4:16

4:16 We therefore are informing the king that if this city is rebuilt and its walls are completed, you will not retain control of this portion of Trans-Euphrates.”

Ezra 4:20

4:20 Powerful kings have been over Jerusalem who ruled throughout the entire Trans-Euphrates and who were the beneficiaries of tribute, custom, and toll.

Ezra 6:6

6:6 “Now Tattenai governor of Trans-Euphrates, Shethar Bozenai, and their colleagues, the officials of Trans-Euphrates – all of you stay far away from there!