Why did the Fatimid Caliphate collapse?

Why did the Fatimid Caliphate collapse? The Fatimid Caliphate was one of the Islamic entities in the Medieval Times. Although this particular caliphate only lasted from 910 until 1171 A.D., the potential was remarkable. Defying the authority and widespread influence of the Sunni Muslim Abbasid Caliphate, the Ismaili Muslim Fatimid Caliphate made its mark on history and remains a significant factor in the relevance of Islam throughout its time. So, why did the Fatimid Caliphate fall from grace after only 2 centuries? And how, exactly, did the Fatimid Caliphate collapse? ♦Consider supporting the Channel of Patreon and gain cool stuff: https://www.patreon.com/Knowledgia ♦Please consider to SUBSCRIBE: https://goo.gl/YJNqek ♦Music Used : Kevin MacLeod - Desert City For You King by Ender Güney Music: Aakash Gandhi - Eyes of Glory Link: https://youtu.be/M6C6MZHBokI​ Music provided by: MFY - No Copyright Licensed under Creative Commons Attribution 4.0 https://creativecommons.org/licenses/by/4.0/ ♦Script & Research : Skylar Gordon ♦Sources : https://military.wikia.org/wiki/Destruction_of_the_Church_of_the_Holy_Sepulchre_1009 https://www.newworldencyclopedia.org/entry/Fatimids_Caliphate#Decay_and_Fall #History #Documentary