Ezra 4:20

20 Powerful kings have ruled over Jerusalem and the entire province west of the Euphrates River, receiving tribute, customs, and tolls.

Ezra 4:20 Meaning and Commentary

Ezra 4:20

There have been mighty kings also over Jerusalem, which have
ruled over all countries beyond the river
As David and Solomon; and the account of these they had in their records, see ( 2 Samuel 8:1 ) ( 1 Kings 4:21 1 Kings 4:24 )

and toll, tribute, and custom, was paid unto them;
as appears from the places referred to; and this served to strengthen the insinuation made to the king, that if these people were suffered to go on building, he would lose his tribute and taxes in those parts.

Ezra 4:20 In-Context

18 “The letter you sent has been translated and read to me.

19 I ordered a search of the records and have found that Jerusalem has indeed been a hotbed of insurrection against many kings. In fact, rebellion and revolt are normal there!

20 Powerful kings have ruled over Jerusalem and the entire province west of the Euphrates River, receiving tribute, customs, and tolls.

21 Therefore, issue orders to have these men stop their work. That city must not be rebuilt except at my express command.

22 Be diligent, and don’t neglect this matter, for we must not permit the situation to harm the king’s interests.”