Ibn Hajar said: “Access between them and the Muslims remained closed until it was gradually opened up. Many of them were taken captive, and rulers vied with one another to acquire them because of their strength and valor. Eventually, most of al-Mu‘tasim’s army consisted of them. The Turks then gained control of the government and killed his son al-Mutawakkil, followed by al-Mutawakkil’s sons one after another, until the Daylamites also gained a foothold in the realm. The Samanid rulers were likewise Turks, and they ruled the Persian lands. The house of Sabuktakīn then gained control of those kingdoms, followed by the house of Seljuq, whose realm extended into Iraq, Syria, and the Byzantine lands. Their remaining followers in Syria were the Zangid dynasty, whose followers were the house of Ayyūb. The Ayyubids likewise recruited large numbers of Turks, who then wrested rule from them throughout Egypt, Syria, and the Hejaz.
“In the fifth century AH, the Ghuzz rose against the house of Seljuq, ravaging the lands and massacring their inhabitants.
“Then came the greatest catastrophe with the Tartars (Tatars). Genghis Khan emerged after 600 AH, and through them the world was set ablaze—especially the East in its entirety—until no land there remained untouched by their evil. Then came the destruction of Baghdad and the killing of the caliph