of the great aşıks before the tradition began to dwindle somewhat in the late 19th century; and several others. The aşıks were essentially minstrels who travelled through Anatolia performing their songs on the bağlama, a mandolin-like instrument whose paired strings are considered to have a symbolic religious significance in Alevi/Bektashi culture. Despite the decline of the aşık/ozan tradition in the 19th century, it experienced a significant revival in the 20th century thanks to such outstanding figures as Aşık Veysel Şatıroğlu (1894–1973), Aşık Mahzuni Şerif (1938–2002), Neşet Ertaş (1938–2012), and many others. The explicitly religious folk tradition of tekke literature shared a similar basis with the aşık/ozan tradition in that the poems were generally intended to be sung, generally in religious gatherings, making them somewhat akin to Western hymns (Azerbaijani ilahi). One major difference from the aşık/ozan tradition, however, is that—from the very beginning—the poems of the tekke tradition were written down. This was because they were produced by revered religious figures in the literate environment of the tekke, as opposed to the milieu of the aşık/ozan tradition, where the majority could not read or write. The major figures in the tradition of tekke literature are: Yunus Emre (1238–1321), who is one of the most important figures in all of Turkish literature; Süleyman Çelebi, 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, who is widely considered the founder of Alevi/Bektashi literature; and Pir Sultan Abdal, whom many consider to be the pinnacle of that literature. Safavid literature The two primary streams of Safavid written literature are poetry and prose. Of the two, poetry—specifically, Divan poetry—was by far the dominant stream. Moreover, until the 19th century, Safavid prose did not contain any examples of fiction; that is, there were no counterparts to, for instance, the European romance, short story, or novel (though analogous genres did, to some extent, exist in both the Turkish folk tradition and in Divan poetry). Divan poetry Safavid Divan poetry was a highly ritualized and symbolic art form. From the Persian poetry that largely inspired it, it inherited a wealth of symbols whose meanings and interrelationships—both of similitude (مراعات نظير mura'ât-i nazîr / تناسب tenâsüb) and opposition (تضاد tezâd)—were more or less prescribed. Examples of prevalent symbols that, to some extent, oppose one another