Q. Who led the Mongol forces at the time of their invasion during Jalauddin Khalji's rule?
Answer: Abdullah
Notes: During Jalauddin's rule, Mongols invaded the north-west frontier of the Delhi Sultanate under Abdullah, who was probably one of the grandsons of Hallu (Hulagu Khan). After few skirmishes, the war was avoided by Jalaluddin by paying tributes and friendly exchanges. Jalaluddin also allowed a group of Mongols to settle in lower Ganges plain on the Lakhnauti frontier (Bengal) of his territory. These mongols were called New Muslims.