What is "carcathiocerta"

Carcathiocerta was a city in Armenian Sophene near the Tigris, identified with the modern town of Eğil. It was the first capital of Sophene until Arsames I founded the new capital Arshamshat around 230 BCE. The Seleucid king Antiochus IV Epiphanes renamed the city into Epiphania. Strabo in his Geography, calls it "The royal city of Sophene".