The tell Sankara or Senkerah is located some 25 km south-east of the ancient city of Uruk.
During year 1853, Loftus, a traveler, identified the Tell Sankara to the ancient city of Larsa, already known as the site of a temple dedicated to the god Shamash. In 1903, the German W. Andrae did the first investigations on the site that was seriously excavated in 1933 by André Parrot. This latest campaign allowed the exhumation of Ebabbar, the temple built by King Sin-Iddinam to the sun god Shamash. Several other searches were organized, led by Jean Margueron then by Jean-Louis Huot.
Tello and Niffer inscriptions evoke "Larsa, the darling city of Babbar." A nail found at Sankara says: "To Babbar, fair lord, the first in heaven and on earth, the largest of the Anunnaki, its king, Sin-idinnam, strong male, who takes care of Ur, king of Larsa, King of Summer and Akkad, e-Babbar for his life built. ... ". The Sumerian god Babbar is the equivalent of Shamash in Akkadian.
And about the Anunnaki, I think it is a Mesopotamian pronunciation of Ankou of Egypt, ie "those of the West". Sankara is "Ank" and "Ara" which means "hill".
It is especially the excavation campaigns of 1970 until 1978 that enabled definitively identify the E-Babbar: Many tablets found evoke the successive repairs of the building by Ur-Nammu, king of Ur, Zabaya and Sin-idinnam, kings of Larsa, Hammurabi, king of Babylon, Barnaburiash II, Kassite King ....
Around 2000 BC, an important and wealthy merchant Amorite named Naplânum, appears in many Ur grain sales tablets. This same individual is likely the one who founded a dynasty in the kingdom of Larsa. At Larsa 14 kings reigned during 2025 to 1763 BC, before the country was annexed to Babylon. These kings are mentioned on a prism stored at the Louvre:
The city of Larsa, and his king Rim-Sin I, appear in the archives of Mari, in the country of Yamutbal : It is through an alliance with Zimri-Lim of Mari that Hammurabi Babylon managed to defeat Larsa.
In Sumerian, Larsa was called Larak. The city is sometimes identified with the Biblical Ellasar.
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My notes of veracity :
The Tell Sankara is the ancient city of Larsa : 5/5