For the third time in a row, a son of Harun al Rashid took control of the umma. Al Mu’tasim is remembered for his close association with the Turkic peoples of the East, an interest supposedly nurtured by his Sogdian mother. Of these men he amassed a personal army during the reigns of his brothers and used it to become an important part of al Ma’mun’s military. The new caliph spent great sums to support and grow his armed forces, leading to a far more martial Abbasid caliphate.