The Memorial for Yelü Yanning (耶律延寧) is the oldest known Khitan inscription of significant length and for now the oldest major written attestation of a Mongolic (or Para-Mongolic) language. Dated 986, it is written in the Mongolic Khitan language using the Khitan large script. With 19 lines and 271 characters it was found in 1964 at Baimu Mountain, Chaoyang County, Liaoning, China. and is now kept in the Liaoning Province Museum, China.