Kuzi-Teshub was the son of Talmi-Teshub

Talmi-Teshub

Talmi-Teshub was "the great-great-great-grandson of Suppiluliuma I" and a viceroy at Carchemish in Syria under Suppiluliuma II. According to royal seal impressions found at Lidar Höyük found in 1985 on the east bank of the Euphrates river, Talmi-Teshub was succeeded by his own son, Kuzi-Teshub....

 who was both the last viceroy of the Hittite Empire at Carchemish

Carchemish

Carchemish or Kargamış was an important ancient city of the Mitanni, Hittite and Neo Assyrian Empires, now on the frontier between Turkey and Syria. It was the location of an important battle between the Babylonians and Egyptians, mentioned in the Bible...

 under Suppiluliuma II

Suppiluliuma II

Suppiluliuma II, the son of Tudhaliya IV, was the last known king of the New Kingdom of the Hittite Empire, ruling ca. 1207–1178 BC , contemporary with Tukulti-Ninurta I of Assyria....

, and a direct descendant of Suppiluliuma I

Suppiluliuma I

Suppiluliuma I was king of the Hittites . He achieved fame as a great warrior and statesman, successfully challenging the then-dominant Egyptian empire for control of the lands between the Mediterranean and the Euphrates....

. He succeeded his father in office according to royal seal impressions found at Lidar Höyük in 1985 on the east bank of the Euphrates river. Kuzi-Teshub then styled himself as "Great King" of Carchemish suggesting that the central Hittite dynasty at Hattusa

Hattusa

Hattusa was the capital of the Hittite Empire in the late Bronze Age. It was located near modern Boğazkale, Turkey, within the great loop of the Kızıl River ....

 had collapsed by his time and that he viewed himself as the one true heir of the line of Suppiluliuma I

Suppiluliuma I

Suppiluliuma I was king of the Hittites . He achieved fame as a great warrior and statesman, successfully challenging the then-dominant Egyptian empire for control of the lands between the Mediterranean and the Euphrates....

.