During his reign he embarked on a vast program of expansion, first conquering the peoples to the north in Asia Minor as far as Nairi and exacting tribute from Phrygia, then invading Aram (modern Syria) conquering the Aramaeans and neo Hittites between the Khabur and the Euphrates Rivers.
When Hazael, king of the Arameans, revolted in Damascus, as Elisha had predicted (II Kings viii. 12), Jehoram made an alliance with his nephew Ahaziah, King of Judah.