Xanthos or Xanthus, also referred to by scholars as Arna, its Lycian name, was an ancient city near the present-day village of Kınık, in Antalya Province, Turkey. The ruins are located on a hill on the left bank of the River Xanthos. The number and quality of the surviving tombs at Xanthos are a notable feature of the site, which, together with nearby Letoon, was declared to be a UNESCO World Heritage Site in 1988.

The Lycian language was the language of the ancient Lycians who occupied the Anatolian region known during the Iron Age as Lycia. Most texts date back to the fifth and fourth century BC. Two languages are known as Lycian: regular Lycian or Lycian A, and Lycian B or Milyan. Lycian became extinct around the beginning of the first century BC, replaced by the Ancient Greek language during the Hellenization of Anatolia. Lycian had its own alphabet, which was closely related to the Greek alphabet but included at least one character borrowed from Carian as well as characters proper to the language. The words were often separated by two points.