Kos Minar

In the third century BC, emperor Ashoka improved existing routes linking his capital city Pataliputra to Dhaka in the east and Kabul via Peshawar in the west and further to Balkh. These routes had landmarks in the form of mud pillars, trees or even wells to guide commuters.[4]

The 16th-century Pashtun ruler Sher Shah Suri introduces improved brick pillars plastered over with lime at every kos. The minars thus came to be called as kos minars.

Abul Fazl recorded in Akbar Nama that in the year 1575 AD, Akbar issued an order that, at every kos on the way from Agra to Ajmer, a pillar or a minar should be erected for the comfort of the travelers.[5][6] In addition, many caravanserais (roadside inns) were built for travelers. Later emperors such as Shah Jahan continued to add to the network of Kos Minars. In the Mughal period, there were around 600 minars.[2] In the north, they were extended as far as Peshawar and in the east to Bengal via Kannauj.

As the British introduced Imperial units and later, independent India adopted the International System of Units, the kos unit of measurement and consequently these minars went out of use. The monuments gradually went into a state of disrepair, as contemporary people ignored their significance.[4] Only 110 Kos minars are left.[2] According to a report of the Archaeology Survey of India, there are 49 in Haryana alone.[7][8] There are also seven Kos Minars in Jalandhar district and five around Ludhiana district in Punjab.[9][10] Conservation work of Kos Minars situated in Jalandhar district started in 2016. Grill fencing was erected at each minar to protect the original structure of Minar.[11] Restoration work for nine Kos Minars near Mathura began in 2018.[4] The Archaeology Survey of India has given Kos Minars protected status and courts have ordered encroachments cleared away.