Conclusion This is a brief picture of what the issue of the Mahdist idea caused, and from it we understand that its revolutions were almost successive, some of which reached the utmost violence, like the Khashshiniyya, and some of which were peaceful, like the Babiyya. Whatever the case may be, this movement affected various Islamic states, Umayyad, Abbasid, and Ottoman, and it also encouraged the Crusaders to understand the weakness of the Muslims, so they attacked them, confident of victory over them. And now, who is responsible for that? . . . The Shiites were persecuted by the Sunnis, and they claimed that they were only doing so in self-defense, but the mistake of Yazid ibn Mu'awiyah in killing Al-Husayn was a great mistake that could not be rectified, so it continued to have its effect throughout the ages. And the Sunnis were not satisfied with that, but they began to kill every Talibian Imam who appeared. If we read the book "Maqātil al-Ṭālibiyyīn"