Carcathiocerta (Armenian: Կարկաթիոկերտ, Karkatiokert or Արկաթիակերտ, Arkatiakert; Ancient Greek: Καρκαθιόκερτα, Karkathiokerta) 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.^{[citation needed]} Strabo in his Geography, calls it "The royal city of Sophene".^[1] It was assigned to the late Roman province of Mesopotamia.^[2] It also bore the names Artagigarta, Baras, Basileon Phrourion, and Ingila.^[3] Under the name Ingila, it became a bishopric; no longer the seat of a residential bishop, it remains a titular see of the Roman Catholic Church.^[4]

Its site is located at Eğil in Asiatic Turkey.^[3][2]