And Timur famously sacked Delhi and really brought the Delhi Sultanate to its knees, and as we will see, it will only last for roughly another 100 years. Now you might also notice that the Ottoman Empire, founded by Usman or Uthman, is continuing to grow and continuing to conquer. Now one thing to keep in mind, in previous videos we talk about the invention of gunpowder in Tang China and the early Song Dynasty, which was about 400 to 500 years before the period that we're talking about right now. As we get into this period, we are now starting to see the use of gunpowder for guns and in particular artillery. And when I say artillery, think cannons. So let's fast forward another 200 years to see how the empires of Asia have evolved. So now we see several things.