In the archives of Salim-Assur son of Issu-Arik, found at Kanes, Assur-Tab, son of Azuzaya, went to Salahsuwa where he sent a man named Adada negotiate at Kussara an agreement to be able to transit goods via the narrow passage or the «Sukinnu Route». He failed and was later caught in the narrow passage.
Kussar was the main political city of the Anatolian peninsula. It is normal that there were agreements between the merchants and the local kings. Kussar is best known in the texts of Hattusa as being the city of the ancestors of the Great King of Hatti who were Pithana and his son Anitta. These kings of Kussar have conquered Kanes and thus formed the outline of what will be called the Hatti or the land of the Hittites. In doing so, they destroyed Kanes, which seems to have definitively stopped the trade relations with Assyria. But perhaps the town declined consecutively of the abandon of the transit through Kanes.
The site of Kusura Höyük near Afyon Karahisar, was searched by Winifred Lamb of the University of Cambridge, from 1935 to 1937. The main archaeological layers have been identified of the Chalcolithic and the Early Bronze Age until the beginning of the trade of the Kanes merchants. The site is famous because of the discovery of female idols which are called Kusura-Beycesultan.
The geographical proximity with Salahsuwa, with the "Sukinnu Route", demonstrated in the texts of Kanes, and almost the similar site name are the three criteria for a plausible connection between the ancient Kussara and the site Kusura Höyük.
It is an argument which justifies the hypothesis proposed by this blog for the "Sukinnu Route".
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My notes of veracity :
4000 years ago, the site of Kusura Höyük as the town of Kussara: 3/5