Hadadezer in Wikipedia

Hadadezer ("Hadad helps") the son of Rehob (Heb. Hadadezer ben Rehob; Aram. Hadadezer bar Rehob) was king of the Aramaean kingdom of Zobah during the early tenth century BCE. According to II Samuel, Hadadezer allied with the Ammonites against King David of Israel but was defeated. Hadadezer's kingdom may have dominated the Aramaean states; after his defeat Damascus began its rise to prominence and states like Hamath sent grateful missives to David.