Sikh literature refers to the writings of the Sikhs. Traditional Sikh literature can be classified into various genres, such as the VÃÂr, SÃÂkhë, RahitnÃÂmÃÂ, the GurbilÃÂs, the Shahëd BilÃÂs, and the Ustat forms. According to Norman Gerald Barrier, the Sikhs of Punjab had the strongest sense of history out of the religious communities of Northern India and their literature covers the Sikh gurus, warriors, the Sikh Empire, and the colonial-period. During the guruship of Guru Gobind Singh, his Kavi Darbars produced literature, although most of these works were lost during the evacuation of Anandpur in 1704, being lost in the Sirsa river as per some accounts. One of these lost works was the large Vidya Sagar Granth. Historically, Sikh works were composed in languages and scripts other than Punjabi and Gurmukhi, such as Braj and Persian, although today Sikh literature is mostly produced in Punjabi in Gurmukhi.