契丹大字
The earliest Mongolic language of which we have written evidence is known as Middle Mongol. It is first attested by an inscription dated to 1224 or 1225 AD, the Stele of Yisüngge, and by the "Secret History of the Mongols", written in 1228 (see Mongolic languages). The earliest Para-Mongolic text is the Memorial for Yelü Yanning, written in the Khitan large script and dated to 986 AD. However, the Inscription of Hüis Tolgoi, discovered in 1975 and analysed as being in an early form of Mongolic, has been dated to 604-620 AD. The Bugut inscription dates back to 584 AD.