Excavations of Tell Chagar Bazar have revealed an occupation from the 7th millennium BC, continuing during the halafienne period between 6000 and 4500 BC. During the period of Obeid and Uruk, the site seems less important before a major reoccupation at the beginning of Early Bronze Age, circa 3000. Some cuneiform inscriptions date from the Akkadian period. Around 2000 BC the site was abandoned before a new reoccupation 1800 BC, the date to which the palace was built.
Ceramics from Habur and hundreds of cuneiform tablets were found there. Those objets are contemporary of the reign of Shamshi-Adad I, well known by Mari archives. Most of them relate to the management of the beer.
The city is permanently abandoned around 1500 BC.
The town has recently been identified as Asnakkum due to a single mention in a tablet. However, the proximity of the site with the tell Brak (Nagar), the tell Mozan (Urkish) and tell Leilan (Subat-Enlil) is an additional argument in favor of the name. Indeed the route Urbana shows that this city was to the west of Subat-Enlil: Urkis and Suna are two intermediate cities.
According the tablets of Mari, Asnakkum was in Idamaras. Isme-Addu was one of its kings.
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My notes of veracity :
The Tell Chagar Bazar was the city of Asnakkum: 3/5