Charles Ellicott Commentary 2 Kings 25:28

"and he spake kindly to him, and set his throne above the throne of the kings that were with him in Babylon," — 2 Kings 25:28 (ASV)

Set his throne above the throne of the kings ... — Gave him precedence over the other captive kings who were kept at the Babylonian court by way of enhancing its glory , and probably marked this precedence by allowing him a higher chair of state in the royal hall. So Cyrus kept Croesus king of Lydia at his court (Herodotus 1.88). We may remember also the chivalrous behavior of our own Black Prince towards his royal captive John of France.