English: Detail of "Guru" Ram Rai from a mural depicting Guru Nanak and Ram Rai listening to hymns together under a tree, circa pre-1688 (likely within the range of 1676–1687). The mural is located at the Ram Rai Darbar of Dehradun (specifically at a location near the southern gate of the darbar, named the Bhai Bahlo Darwaza). The mural is alternatively (and probably more accurately) dated to the beginning of the 18th century (circa early 18th century).

The Ram Rai Darbar of Dehradun has possibly the earliest extant or known wall paintings of the Sikh Gurus (Ref. 'Early Wall Painting of Garhwal' by B.P. Kamboj). It contains other depictions of important figures of the Ramraiya and Udasi sects, too. The painting of Guru Nanak is based on a miniature from 1685 in the collection of the Darbar. Ram Rai has the title of "Guru" because these paintings were commissioned by him and his Ramraiya sect. He is of course not considered a "Guru" by mainstream Sikhs.

Another image showing detail of this mural can be found at: https://commons.wikimedia.org/wiki/File:Possibly_the_earliest_extant_mural_of_Guru_Nanak,_circa_1675.jpg#%7B%7Bint%3Afiledesc%7D%7D

Further reading: Malhotra, Karamjit K. “Professor J.S. Grewal Prize: IN SEARCH OF EARLY SIKH ART.” Proceedings of the Indian History Congress, vol. 71, 2010, pp. 397–408. JSTOR, http://www.jstor.org/stable/44147507.