It has historically been of importance and influence in North Africa and Egypt with many contributions to Islamic literature. Among the figures most known for their literary and intellectual contributions are Ibn 'Ata Allah, author of the "Hikam", and Ahmad Zarruq, author of numerous commentaries and works, and Ahmad ibn Ajiba who also wrote numerous commentaries and works. In poetry expressing love of Muhammad, there have been the notable contributions of Muhammad al-Jazuli, author of the "Dala'il al-Khayrat", and Busiri, author of the famous poem, the Qaṣīda al-Burda. Many of the head lecturers of al-Azhar University in Cairo have also been followers of this tariqa.