Nestled on the banks of the eternal Ganga, Kanpur stands as one of North India’s major industrial centres with its own historical, religious and commercial importance. Believed to be founded by king Hindu Singh Chandel of the erstwhile state of Sachendi, Kanpur, it is believed by some, derived its name from Kanhiyapur, the town of Kanhiya (Lord Krishna). In the course of time, Kanhiyapur probably was abbreviated as Kanhapur and subsequently as Kanpur (the anglicized spelling of which was Cawnpore during the British rule). Others believe that the name is derived from Karnapur and is associated with Karna, one of the heroes of Mahabharata. Duryodhana made Karna a king, seeing him as a fitting match to Arjuna, and gifted him this area; hence the name Karnapur, which later became Kanpur. Historically, Jajmau on the eastern outskirts of present day Kanpur is regarded as one of the most archaic townships of Kanpur district.
Kanpur's growth until the thirteenth century is shrouded in the mists of time. It is interesting to note that while no reference to Kanpur is found in history, the history of two of its suburbs, Jajmau and Bithoor, can be traced back to legendary times. Bithoor is located about 20 km upstream of the river from the city and is approximately 10 km from the IIT Kanpur Campus. Jajmau is about 8 km east of Kanpur city and is nearly 20 km upstream of the river from the IIT Campus. According to Hindu mythology, just after creating the universe, Lord Brahma performed the Ashvamedh Yajna (Horse Sacrifice) at Bithoor (also known as Brahmavart) and established a shivalingam there. Moving further to later times, another mythological site at Bithoor is the Valmiki Ashram, where the famous sage Valmiki is supposed to have written the Sanskrit epic Ramayana. According to this epic, queen Seeta, on being exiled by King Ramachandra of Ayodhya, spent her days in seclusion at the ashram bringing up her twin sons Lava and Kush.
At Jajmau there are remains of an ancient fort, now surviving as a huge mound. Some recent excavations on this mound tend to prove that the site is very ancient indeed, perhaps dating back to the Vedic age. Popular legends have it that the fort belonged to Yayati, a king of the ancient chandravanshi race, the eighth in succession to Lord Brahma. The famous Siddhnath temple of Lord Shiva and Siddha Devi temple at Jajmau belong to the Buddhist period. The place for a while was known as Siddhpuri.
Another interesting historical place near Kanpur is Shivrajpur. It is located around 20kms from Kanpur Railway Station. At Shivrajpur, there is an ancient temple built by Raja Sati Prasad in memory of his queen. This temple got built in a day and is situated on the banks of river Ganga. This temple is famous for its beautiful architectural work and its unique carving designs.
In 1207 AD Raja Kanti Deo of Prayag who was attached to the throne of Kannauj established the village Kohna, which later came to be known as Kanpur. Kanpur continued its association with Kannauj during the reins of Harsha Vardhan, Bhoj, Mihir, Jai Chand and early Muslim rulers. Later it came under the Jaunpur rulers and the Sur Dynasty. The first mention of Kanpur was made in 1579 during Sher Shah's regime. Up to the 1st half of the 18th century Kanpur continued to survive as an insignificant village. Its fate, however, took a new turn soon after. In May 1765, Shuja-ud-daula, the Nawab Wazir of Awadh, was defeated by the British near Jajmau. From 1773 to 1801, it was part of the Oudh kingdom and then came into the hands of the British. It was probably at this time that strategic importance of the site of Kanpur was realised by the British. European businessmen had by this time gradually started establishing themselves in Kanpur. In order to ensure protection to their lives and property the `Awadh local forces’ were shifted here in 1778. Kanpur passed into British hands under the treaty of 1801 with Nawab Saadat Ali Khan of Awadh. This forms a turning point in the history of Kanpur. Soon Kanpur became one of the most important military stations of British India. It was declared a district on 24 March 1803. South of Parmat were the British infantry lines and the parade grounds. Indian infantry occupied the space from the present Chunniganj to the Christ Church College. The Company Bagh was laid in 1847 and the construction of the Ganga canal was commenced in 1854.

In the 19th century Cawnpore was an important British garrison with barracks for 7,000 soldiers. In 1857, during the The Indian Mutiny, (also known as the First War of Independence) 900 British were besieged in the fortifications for 22 days by rebels under Nana Sahib. They surrendered on the agreement that they would be given safe passage to the nearby Suttee Chaura Ghat whereupon they would board barges and be allowed to go by river to Allahabad. However as they boarded the boats they were fired upon by cannon. Many were killed and the remaining 200 were brought back to shore where they were locked-up in insufferable conditions in a building called the Bibighar. After some time, when it was apparent that the British under General Havelock were likely to retake Kanpur, the captors decided to execute their hostages. The prisoners, about two-thirds of whom were women, children & babies, were butchered by their captors three days before the British entered the city on July 18. The corpses were thrown into a deep well nearby.
The Bibighar was dismantled by the British during the reoccupation of Kanpur, and a memorial railing and a cross were raised at the site of the well. The well is now bricked over. Only the remains of a circular ridge survive, which can still be seen at the Nana Rao Park. The Kanpur Memorial Church – `All Souls' Cathedral’ - was raised in honor of the fallen at the north-east corner of Wheeler’s entrenchment in 1862 by the British. The marble gothic screen with the famous `mournful seraph’ was transferred to the churchyard of All Souls' Church after independence in 1947, and in its place a bust of Tantya Tope installed as Nana(Sahib) Rao Park.

After 1857 it became an important center of the leather and textile industries. Government Harness and Saddler Factory was started for supplying leather material for army in 1860, followed by Cooper Allen & Co. in 1880. The first cotton textile mill, the Elgin Mills were started in 1862 and Moiré Mills in 1882. The British India Corporation (BIC) was headquartered here and led the development of many industries. The first Indian business house of Cawnpore was the firm NihalChand KishoriLal which set up a trading facility in 1857. This firm was a leader in Oil milling and had many oil mills spread across North India. The Juggilal Kamlapat Singhania family launched many industrial units between 1930 and 1970. The group is known as J K Group of Industries till date. The Jaipuria family contributed to the patriotic cause, by building the Swadeshi Cotton Mills in response to charges that the foreign rulers were raiding India of its cotton only to sell back textiles to the residents. Kanpur was known as the "Manchester of India" during the 20th Century. The NihalChand KishoriLal group (also knows as Kejriwal Group) over time diversified into flour milling, tea plantations and steel. They bought over in 1942 Cawnpore Flour Mills which had been established in 1886 by Edward Foy a Scotsman. New Cawnpore Flour Mills is at present one of the larger flour mills of North India and still managed by the same family. The steel industry was first brought to Kanpur by Singh Engineering and grew with JK Steel and the many ordanance factories which were set up. The Kejriwal's set up a ministeel mill on the outskirts of Kanpur which is now a leading long products manufacturer. Kanpur is also an important center for India's leather industry with numerous leading manufacturers, situated in the Jajmau Leather Industrial hub, which is exported worldwide. It is supposed to be the largest Sugar market in entire North India. As of now, the city also owns many leather tanneries, a 2-wheeler factory owned by LML India, under collaboration with Italy's Piaggio; and over a dozen Defence Ordnance Factories such as Small-Arms Factory, Ordnance Parachute Factory etc. It is also home to the pan masala and gutkha industry.
Many of the British contributed vigorously to charitable causes in the city by building the Ursula Horsemann Hospital, the "Hallet" Hospital, Harcourt Butler Technological Institute, by protecting the Allen Forest (now a Zoo) and many other efforts. Most of these are now renamed, though a lot of residents still call them by their old names. The distortion of names is most visible at the railway crossing bridge next to the Railway Station, where the now-closed Murray Company is conveniently called Mari (Dead) Company.
As every other city, Kanpur too has its problems. Due to the onset of leather industries, the pollution level, especially air pollution has gone to a dangerously high level. Apart from this, due to unplanned, uncoordinated growth over centuries, the city is more like a huge village. Urban planning has yet to evolve. Agencies responsible for it have still a long way to go from selling plots of land to planning wholesome development. A recent article in the Time Asia magazine says it all regarding the pollution in the city.