Sikhism was brought to the world around 1469 by Guru Nanak Dev, the first of the "Ten Gurus". Guru Nanak brought the Word of God to manifest upon Earth. Through his Hymns and Prayers (Shabads), he inspired and uplifted humankind to live a life of truth, righteousness and spirituality. These Hymns and Prayers were compiled into the Siri Guru Granth Sahib. Unique amongst the world's major religious scriptures, while compiling the Guru Granth Sahib, the Sikh Gurus incorporated not only their own writings, but also included the writings of other contemporary saints from Hinduism and Islam (including saints belonging to the lowest strata of untouchables in the Hindu Caste System), who believed in the unity of God and denounced superstition and caste. Further, the composition and compilation of the Guru Granth Sahib was performed by the Sikh Gurus themselves, rather than being performed by their adherents and followers.