Explanation:

Bhai Mani Singh was an 18th-century Sikh scholar and martyr. He was a childhood companion of Guru Gobind Singh and took the vows of Sikhism when the Guru inaugurated the Khalsa in March 1699. Soon after that, the Guru sent him to Amritsar to take charge of Harmandir Sahib, which had been without a custodian since 1696. He took control and steered the course of Sikh destiny at a critical stage in Sikh history.

He expanded the first of Bhai Gurdas's Vaars into a life of Guru Nanak which is called Gyan Ratnavali. Mani Singh wrote another work, the Bhagat Ratnawali (sometimes called Sikhan di Baghat Mala), an expansion of Bhai Gurdas's eleventh Vaar, which contains a list of famous Sikhs up to the time of Guru Har Gobind.