Kitan

Khitan or Kitan ( in large script or in small, Khitai; Chinese: 契丹語, Qìdānyǔ), also known as Liao, is an extinct language once spoken in Northeast Asia by the Khitan people (4th to 13th century CE). It was the official language of the Liao Empire (907–1125) and the Qara Khitai (1124–1218). Owing to a narrow corpus of known words and a partially undeciphered script, the language has yet to be completely reconstructed.

From Wikipedia · Khitan language · CC BY-SA 4.0