It is believed by locals that Pilibhit was ruled by an ancient king named Mayurdhwaj or Moredhwaj or King Venu, a great devotee of lord Krishna and a loyal friend of Arjun. King Venu's name and the geography of his kingdom can be traced in the Hindu epic Mahabharat.
https://en.wikipedia.org/wiki/Pilibhit
https://en.wikipedia.org/wiki/Pilibhit
