Punjabi is written in two different scripts, called Gurmukhī and Shahmukhī. Punjabi is the main language spoken by the Sikhs. Most parts of the Guru Granth Sahib use the Punjabi language written in Gurmukhī, though Punjabi is not the only language used in Sikh scriptures. The "Janamsakhis", stories on the life and legend of Guru Nanak (1469–1539), are early examples of Punjabi literature.