Guru Arjun Dev (misspelled as Guru Arjundev) compiled the Adi Granth, the primary scripture of Sikhism, which later became the Guru Granth Sahib. Guru Nanak was the founder of Sikhism, Guru Amardas was the third Guru, and Guru Gobind Singh (misspelled as Guru Govindsingh) declared the Granth Sahib as the eternal Guru but didn't compile the original Adi Granth.