When Samlah died, Shaul from Rehoboth on the Euphrates River ruled in his place.

and eastward he dwelt as far as the entrance to the wilderness from the river Euphrates; for their cattle were multiplied in the land of Gilead.

David also defeated King Hadadezer of Zobah at Hamath when he went to establish his control at the Euphrates River.

When the Arameans realized that they had been defeated by Israel, they sent messengers to summon the Arameans who were across the Euphrates. They were led by Shophach, the commander of Hadadezer’s army.