Hadadezer ben Rehob

Hadadezer, son of Rehob, was king of Zobah or Sova, a Syrian kingdom that may have been in the Beqaa Valley, extended along the eastern side of the Anti-Lebanon mountains, reaching Hama to the north. Zobah exercised power throughout southern Syria and inevitably clashed with the expanding empire of Israel.

Biography

, king of Ammon, hired Hadadezer in his war against David. Joab found them in a double-battle array, with the Ammonites toward the capital of Rabbah and the Sovan mercenaries near Madaba. David battled the Sovans, which caused them to scatter. This alarmed the Ammonites, who fled back to their capital.
After the Syrians were defeated, Hadadezer traveled north to "recover his border". The power of the Ammonites and the Syrians was finally broken, and David's empire expanded to the Euphrates according to 2 Samuel 10:15–19 and 1 Chronicles 19:15–19.