Our sources now begin to grow more and more scanty, and we must hasten over long intervals of time and pass with little connection from one name to another. Preliminary investigations are also to a great extent lacking, and it is possible that the centuries which we shall merely touch may have witnessed developments only less important than those with which we have already dealt. But that is not probable; for when, after a long silence, the curtain rises again for us in the twelfth Muslim century, we shall find at work only those elements and conditions whose inception and growth we have now set forth. One name in our rapid flight deserves mention, at least. It is that of Umar ibn al-Farid, the greatest poet that Arabic mysticism has produced. He was born at Cairo in 586, lived for a time at Mecca, and died at Cairo in 632. He led no new movement or advance, but the East still cherishes his memory and his poems. [Sidenote: DARWISH FRATERNITIES] We have already noticed (p. 177) the beginnings of darwish Fraternities and the founding of monasteries or _khanqahs_. During the period over which we have just passed, these received a great and enduring impetus. The older ascetics and _walis_ gathered round them groups of personal followers and their pupils carried on their names. But it was long, apparently, before definite corporations were founded of fixed purpose to perpetuate the memory of their masters. One of the earliest of these seems to have been the fraternity of Qadirite darwishes, founded by Abd al-Qadir al-Jilani, who died in 561 at Baghdad, where pilgrimage is still made to his shrine. So, too, the Rifa‘ite Fraternity was founded at Baghdad by Ahmad ar-Rifa‘a in 576. Another is that of the Shadhilites, named after their founder, ash-Shadhili, who died in 656. Again another is that of the Badawites, whose founder was Ahmad al-Badawi (d. 675); his shrine at Tanta in Lower Egypt is still one of the most popular places of pilgrimage. Again, the order of the Naqshbandite darwishes was founded by Muhammad an-Naqshbandi, who died in 791. Among the Turks by far the most popular religious order is that of the Mawlawites, founded by the great Persian mystical poet, Jalal ad-Din ar-Rumi (d. 672), whose _Mesnevi_ is read over all Islam. These and very many others, especially of later date, are still in existence. Others, once founded, have again become extinct. Thus, Ibn Sab‘in, though he was surrounded by disciples who for a time after his death carried on the order of Sab‘inites, does not seem now to have any to do him honor. The same holds of a certain Adi al-Hakkari who founded a cloister near Mawsil and died about 558. It is significant that al-Ghazzali, though he founded a cloister for Sufis at Tus and taught and governed there himself, left no order behind him. Apparently in his time the movement toward continuous corporations had not yet begun. It is true that there are at present in existence darwish