During the reign of Mai Daud, the Bulala attacks intensified. As a result, Daud was driven from the Kanem capital, Njimi, and finally killed by the Bulala. Then, towards the end of the fourteenth century, Mai Umar ibn Idris who ruled from 1384 to 1388 AD was driven out of Kanem by the Bulala, he transferred his capital to the rich pastoral country of Bornu, west of Lake Chad. Many of his people who were still semi-nomadic followed him to found the second Kanuri empire of Bornu.