Muhammad marries Aisha after the death of Khadijah, and Aisha is a significant figure in early Islam. She's considered to have a very strong personality. Many of the Hadith are narrated by her. The Hadith are the Muslim traditions and accounts of Muhammad's life, and it's a significant part of the religion outside of the Quran. And she is married to Muhammad at a very, very young age, and there's some debate about how young she actually was, but as we'll see, she also figures prominently in this narrative and in this schism that develops between the Sunni and the Shia, and the Sunni and the Shia view her differently. So let's go back to the timeline here. So as Muhammad's life nears its end in 632, in previous videos, we talk about his final pilgrimage to Mecca, and then on his way back to Medina, at a place like Gather Qum, he gives a sermon, a sermon that is especially very important to the Shia.