however, the realization of the Caliphate by Fatimah, in the sense of her mediation in establishing the government of God, is a matter of careful examination, but rather it is wrong; because the mediation of a woman in establishing the government of God, even if she is the leader of women of the worlds like her, is not in accordance with the way of God, and there may be hardships in it in practice; as God has considered Maryam a “woman of truth” and has not considered her a “woman Prophet” or “woman Caliph”[1]. Therefore, the Caliphate, in the sense of mediation in establishing the government of God, is proven for Ali, Hasan, and Husain, and is not proven for Fatimah despite the fact that her purity from every impurity, her inseparability from the Book of God, and, accordingly, the obligation to obey and have affection for her are proven, and it is clear that the Caliphate of Ali, Hasan, and Husain is successive, because as it was said, the existence of more than one Caliph at one time is not rational, and therefore, any of them who was born earlier has become a member of the Ahl al-Bayt of the Prophet earlier and, accordingly, has been entitled to be held in affection and obeyed by Muslims earlier. Yes, it is not possible that the intended meaning of the Ahl al-Bayt of the Prophet in the sense of his Caliphs is limited to these three and ends with Husain, who was the youngest of them and, accordingly, the last one of them; because the requirement of the mutawatir narration from the Prophet about their inseparability from the Quran until the Day of Judgment is their survival along with the Quran until the Day of Judgment, and it is clear that Muslims’ need for the Caliph of the Prophet remains after Husain. Based on this, the existence of the Ahl al-Bayt for the Prophet and the Caliphs from among them after Husain is essential, and they are inevitably from the Ahl al-Bayt of Husain; because his Ahl al-Bayt, following him, are from the Ahl al-Bayt of the Prophet , and the closest people to him are considered the closest people to the Prophet after him; in view of the fact that he was the closest person to the Prophet in his time, and therefore, the closest person to him is considered the closest person to the Prophet after him, and it is clear that the closest people to him were his children, such as Ali ibn Husain known as Zayn al-Abidin (d. 94 AH), not the children of his brother Hasan, such as Abdullah ibn Hasan (d. 61 AH), Hasan ibn Hasan (d. 87 AH), and Zayd ibn Hasan (d. 120 AH),