Now what we see here in this dark brown is what was in control of this Muslim community at the time of Muhammad's death. And you see, even by that period, they had control of a good chunk of the Arabian Peninsula. And what's particularly surprising is how fast Islam spread shortly after that. The next period, after Muhammad dies, the leadership of the community, of the ummah, goes to the caliphs. And this actually becomes a contentious issue that we'll talk about in other videos. It's the seed of the eventual schism between the Sunnis and the Shias. But this next period, the Rashidun, or the rightly guided caliphs, caliph means successors, essentially successors to Muhammad.