Among the major historical and biographical works in classical Persian, one can mention Abolfazl Beyhaghi's famous "Tarikh-i Beyhaqi", "Lubab ul-Albab" of Zahiriddin Nasr Muhammad Aufi (which has been regarded as a reliable chronological source by many experts), as well as Ata-Malik Juvayni's famous "Tarikh-i Jahangushay-i Juvaini" (which spans the Mongolid and Ilkhanid era of Iran). Attar's "Tazkerat-ol-Owliya" ("Biographies of the Saints") is also a detailed account of Sufi mystics, which is referenced by many subsequent authors and considered a significant work in mystical hagiography.