), who is one of the most important figures in all of Turkish literature; Süleyman Çelebi (?–1422), who wrote a highly popular long poem called "Vesîletü'n-Necât" (وسيلة النجاة "The Means of Salvation", but more commonly known as the "Mevlid"), concerning the birth of the Islamic prophet Muhammad; Kaygusuz Abdal (1397–?