Timurids (Crusader Kings 2)

Timurids is a titular empire. The title does not exist by default in the timeframe of Crusader Kings II or The Old Gods DLC, but can be created by the player or the AI.

Invasion from the Steppe
At some point between 1360 and 1405, with a mean-time-to-happen of 180 months, a vast horde of over 100,000 Mongol warriors united under Timur the Lame will emerge in a province at the eastern edge of the map. They will immediately declare war for the top-liege title of the province they appear in. The Timurids will continue warring with their neighbours until they run out of troops.