The aged Emperor, his father knew that his sons would fight for power after he died. This was the Mughal custom. Therefore, taking precaution, he divided his empire into four regions for each of them to rule. They all had their own government, army, etc. Dara was given governorship of Multan and Kabul in the extreme northwest. Shuja, the second son got Bengal the eastern most province. Aurangzeb was in Deccan in extreme south and Murad, the last son, had Gujerat in the west.
