According to Dr H. C. Ray, the ancestors of the Kamboja rulers of Bengal came from west with Gurjara Pratiharas. The Kambojas had joined the forces of Gurjara Pratiharas and there were separate regiments of the Kambojas in the Pratihara army which were entrusted with the defence of north-eastern borders of the Pratihara empire. The Kambojas did not leave the province after the collapse of Pratihara power. Rather, they took advantage of the weakness of the Pala kings and set up an independent kingdom which was not a difficult task for them. Expelled from Hindukush/Pamirs, the Kambojas are stated to have formed a large contingent of the Gurjaras. Dr Hem Chander Raychaudhury also states that the Kambojas came to Bengal with the armies of the Gurjara Pratiharas. Dr R. C. Majumdar also agrees with the view that the Kambojas may have come to Bengal with Pratiharas when they conquered part of the province.