Adam Clarke, on Esth 1:2

“When he sat on the throne of his kingdom, the city Susan was the capital of his kingdom.”

“Sat on the throne of his kingdom - Having subdued all his enemies, and brought universal peace to his empire. See the commencement of the introduction. Shushan the palace - The ancient city of Susa, now called Shuster by the Persians. This, with Ecbatana and Babylon, was a residence of the Persian kings. The word הבירה habbirah, which we render the palace, should be rendered the city, εν Σουσοις τῃ πολει, as in the Septuagint.”

Imported from an open dataset — not yet checked against the printed edition.