Mongolic languages
Proto-Mongolic is the hypothetical ancestor language of the modern Mongolic languages. It is very close to the Middle Mongol language, the language spoken at the time of Genghis Khan and the Mongol Empire. Most features of modern Mongolic languages can thus be shown to descend from Middle Mongol. An exception would be the Common Mongolic pluritative voice suffix "-cAgA-" 'do together', which can be reconstructed from the modern languages but is not attested in Middle Mongol.