1) Merodach-baladan, the king of Babylon, sent letters and a gift to Hezekiah, king of Judah, after hearing about his illness and recovery.
2) Scholars have struggled to reconcile this account with other biblical passages since Babylon was under Assyrian rule at this time. However, recent discoveries have shed light on a period where Merodach-baladan briefly usurped the Babylonian throne.
3) Merodach-baladan likely sent the envoy to form an alliance against their common enemy, the Assyrians, and inquire about the miracle of the sun dial's shadow reversing, which interested the Babylonians as astronomers.