The earliest record of the name of Cappadocia dates from the late 6th century BC, when it appears in the trilingual inscriptions of two early Achaemenid kings, Darius I and Xerxes, as one of the countries (Old Persian dahyu-) of the Persian Empire. In these lists of countries, the Old Persian name is Katpatuka, which is of uncertain origin: the name could be genuine Old Persian, meaning either “land of the Ducha/Tucha” or “land of the beautiful horses” (consistent with the fact that ancient Cappadocia was famous for its horse breeding); according to another theory, it is a Persianized form of the Hittite name for Cilicia, Kizzuwatna.[ The Elamite and Akkadian language versions of the inscriptions contain a similar name from Akkadian katpa “side” and a chief or ancestor’s name, Tuka.