It refers to the struggle which took place among Rashtrakutas, Pratiharas and Palas to control Kanauj. Kanauj was a famous city of north India. It was strategically very important in north India. It means that the king who controlled Kanauj could control the fertile plain of the Ganges. So many battles were fought for its control. The Rashtrakutas, Pratihars and Palas—all these dynasties controlled Kanauj one by one. Modern historians call this struggle as tripartite struggle.