Explanation:

The Janamsakhis, literally birth stories, are writings which profess to be biographies of the first Sikh guru, Guru Nanak. These compositions have been written at various stages after the death of the first guru.

The four Janamsakhis that have survived into the modern era include the Ancient,Bala, Miharban, Bhai Mani's versions, and each hagiography contradicts the other.

The term Puratan janamsakhis means ancient janam-sakhis is the most reliable and is generally used with reference to the composite work which was compiled by Bhai Vir Singh and first published in 1926. Of the still existing copies of the Puratan Janam-sakhis the two most important were the Colebrooke and Hafizabad versions. The first of these was discovered in 1872, the manuscript had been donated to the library of the east India company by H.T. Colebrooke and is accordingly known as the Colebrooke or Vailaitwali Janamsakhi. Although there is no date on it the manuscript points to around 1635.