In 1943, a cuneiform tablet in Hittite language was found at a place called "Höyük Tepe", located 1,500 meters west of the village of Masat Höyük. This indication enabled T.Özguç, at the head of a team of Turkish archaeologists, to planning systematic excavations from 1973.
At 880 meters high, a lower city and a citadel on a rock were exhumed. It appeared three levels of Hittite monuments, as well as seals and about 350 tablets in the oldest levels, dated from the time of Tuthaliya III.
The above information was taken from "The debut of the new Hittite Empire:The Hittites and their history" from Jacques FREU and Michel MAZOYER.
The translated tablets revealed two main persons : an administrator name Himuili and a troop commander called Kassu. Both were assigned to the city of Tapikka:
Also, archaeologists realized that this ancient city, located about 140 km east-northeast of the capital Hattusa, was the provincial center of Tapikka.
Most of the letters were written from Hattusa, the Hittite capital at the beginning of a period of about 10 years of correspondence. Historians have concluded that it was the residence of Tuthaliya III. At the end of the period they were written from Sapinuwa due to an invasion of Gasgas.
These tablets, as well as those of Ortaköy and Kuşaklı, which are dated from the same period, show that the scribes were all from Syria / Mesopotamia, and that they practiced their trades in Anatolia since many generations.
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My notes of veracity :
Masat Höyük was Tapikka: 5/5