The ancient skeletal remains of a dog identified as being of the greyhound/saluki form was excavated at Tell Brak in modern Syria, and dated to approximately 4,000 years before present.While similar in appearance to Saluki or Sloughi, DNA sequencing indicates that the greyhound is more closely related to herding dogs. This suggests that Greyhounds are either progenitors to or descendants of herding types. Historical literature by Arrian on the vertragus (from the Latin vertragus, a word of Celtic origin), the first recorded sighthound in Europe and possible antecedent of the Greyhound, suggested that its origin lies with the Celts from Eastern Europe or Eurasia.