וּמַלְכִ֣ין תַּקִּיפִ֗ין הֲווֹ֙ עַל־יְר֣וּשְׁלֶ֔ם וְשַׁ֨לִּיטִ֔ין בְּכֹ֖ל עֲבַ֣ר נַהֲרָ֑ה וּמִדָּ֥ה בְל֛וֹ וַהֲלָ֖ךְ מִתְיְהֵ֥ב לְהֽוֹן׃
There have been mighty kings also over Jerusalem, who have ruled over all the country beyond the River; and tribute, impost, and toll, was paid unto them.
Read midrashic interpretation of Ezra 4:20: and classical rabbinic exegesis.