Explanation:

Panipat district was carved out from the erstwhile Karnal district on 1 November 1989. On 24 July 1991 it was again merged with Karnal district. On 1 January 1992, it again became a separate district. According to the legend, Panipat was one of the five cities (prasthas) founded by the Pandava brothers during the times of the Mahabharata; its historic name was Pandavaprasth. Panipat was the scene of three pivotal battles in Indian history. Panipat is first recorded in the Mahabharata as one of the five villages that the Pandavas demanded from Duryodhana. The five villages are the "panch pat":

Panaprastha (now known as Panipat)
Suvarnaprastha (now known as Sonipat)
Indraprastha (now known as Delhi)
Vyaghraprastha became Baghpath (now known as Baghpat)
Tilaprastha (now known as Tilpat)