Battle of Chausa was fought near Buxar. Humayun was badly defeated and Sher Khan adopted the title of Sher Shah. Humayun barely escaped with his life from the battle field.
The Qanun-i Humayuni which is also called Humayun Namah was composed in 1534 CE by Khvandamir who was one of the officials under Humayun’s patronage. The memoir is an eyewitness account of Humayun’s reign.