Zafarnamah is a historical letter of victory written by Guru Gobind Singh to Emperor Aurangzeb in 1706 A.D. The letter, written in lucid Persian, depicts the spirit of Charhdi Kala and admonishes Aurangzeb for his tyrannical rule. On receipt of this letter the emperor was deeply touched and his conscience was shaken. It is an important historical document of the time and is always regarded as a source of inspiration for the Khalsa spirit.