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Ashur (aka Assur or Asur) is on the west bank of the Tigris, north of where it is joined by the Lesser Zab. Today, it is modern قلعة شرقاط, meaning Castle Sherqat and commonly transliterated as Kaleh-Shergat or Qala't Shargat.

When looking at artifacts, a winged sun-disk (sometimes containing a homunculus) represents Ashur. Excavations began by Germans under W. Andrea's leadership in 1913-1914.

ashur ishtar temple foundation inscription assyria
Foundation inscription
Ishtar Temple built by Tukulti-Ninurta. 1243-1207 BC. Assur. Lead. Istanbul Museum of the Ancient Orient. Inv No 8856, 8857. Image my L. M. Clancy, 2009/08/28



whc.unesco.org (great article from when Ashur was nominated to be a world heritage site