Nehemiah 2:9

2:9 Then I went to the governors of Trans-Euphrates, and I presented to them the letters from the king. The king had sent with me officers of the army and horsemen.

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!

Ezra 7:21

7:21 “I, King Artaxerxes, hereby issue orders to all the treasurers of ¹  Trans-Euphrates, that you precisely execute all that Ezra the priestly scribe of the law of the God of heaven may request of you –

¹ tn Aram “who are in.”