They are not among the hordes enumerated by Rameses II.
They issued from the land of Barsilia, and extended their rule over the Bulgarian hordes left masterless by the Turks, compelling the more stubborn to migrate to the Danube (641).
A theory which seems plausible is that which assumes them to have been a heterogenous collection of Mongol, Tungus, Turki and perhaps even Finnish hordes under a Mongol military caste, though the Mongolo-Tungus element probably predominated.
The former of these subdued Khorasan, Rai and Isfahan, while the latter brought practically all Persia under his sway, conquered Bokhara, Samarkand and Otrar, capital of the Karakitai, and had even made himself master of Ghazni when his career was stopped by the hordes of the Mongol Jenghiz Khan.
Fresh risings of the defeated dynasties followed each new enterprise, and he had also to deal with the Mongol hordes whose territory marched with northerii Persia.