Rohillas (i.e. hillmen), a tribe of Afghans who settled in a district N. of Oudh, called Rohilkhand after them, and rose to power in the 18th century, till their strength was broken by the British in 1774.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Rohilkhand * Rohlfs, F. Gerard