Haddu, identified with the modern Tell Malhat ed-Deru (تل مليحة الدور), was an ancient kingdom in northern Syria in Deir ez-Zor Governorate.
History.
Early Bronze.
In the middle of the third millennium BC, the Kingdom of Haddu flourished and controlled the middle Khabur valley.
Ebla-Mari War.
It was ruled by its own monarch who was a vassal of Ebla, and fought against the kingdom of Mari. The king of Haddu declared to Mari's ambassador that he "I and Ebla have a pact of peace. And the oath of the pact is before Kura (the main Eblaite god) and before Hadda".
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Citations.
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