Q. In which year did Ashok Challa invade the region now known as Uttarakhand?
Answer: 1191
Notes: Ashok Challa, a Khas king from Nepal, invaded the region now called Uttarakhand in 1191. This invasion led to the collapse of the existing kingdom there and brought Garhwal under his control. Krachalla, his successor, invaded the area in 1223, continuing Khas expansion in the western Himalayan region during the medieval period.