Not only the emperor, but his sons all die from the bubonic plague. And so you see here on this timeline, the Il Khanate goes into a rapid decline because of the Black Death. And at the same time, in the southwest corner of the Shagatai Khanate, a future conqueror is born. Timur, which means iron. He's often known as Timur Lane because when he was young, he was injured in both the hand and leg by arrows, which impaired his movement, and which is why the Europeans called him Timur the Lame, which became Timur Lane. But despite his physical impairments, he's able to conquer much of the Shagatai Khanate eventually and the Il Khanate and establish a dynasty of his own. The empire gets established in 1370 when he gets effective power over much of the western Shagatai Khanate.