The conflict between the Nizaris and the Musta'lians had a clear impact on the Fatimid caliphate, as the Caliph al-Amir was killed at the hands of the Nizaris without leaving an heir to inherit the throne and leaving one of his wives pregnant. That was in the research, but it counted as a departure from the Ismaili beliefs, so Sayyida Al-Hurra, Queen of Yemen, opposed it, claiming that the truth belongs to Al-Tayyib Ibn Al-Amir, and she took it upon herself to spread the call to him, so the Tayyibi call appeared.