The Dar al-Ilm (House of Knowledge) was founded in Cairo, Egypt by the Fatimid Caliph-Imam al-Hakim in the year 1005 A.D., in a section of the Fatimid palace in Cairo.
Many subjects were taught at the Dar al-Ilm, which was also equipped with a large library. Many Fatimid dais received part of their training at this institution. The Fatimid dais produced numerous theological treatises in which the doctrine of Imamat retained its centrality. The dai-authors also dealt with a host of theological issues as well as metaphysical systems in which they included a variety of cosmological doctrines.
During the Fatimid period (909-1171), the Ismailis elaborated a diversity of intellectual traditions and institutions of learning, making important contributions to Islamic thought and culture.
Source: Heinz Halm The Fatimids and their Traditions of Learning (London: I.B. Taurus & Co. Ltd., 1997)