Ismaili History 566 - Reopening of Majalis al-Hikmah
It has been hitherto discussed the closure of the majalis al-hikmah during the period of Imam al-Hakim. But it was evidently reopened by his successor, az-Zahir. He conferred the office of the qadi and the mission in the royal palace (bab al-khalifa) to Qadi Kassim bin Abdul Aziz bin Muhammad bin an-Noman in 418/1027, ordering to take charge of the mission and the proper guidance of the readings of the majalis al-hikmah and the spread of the science of tawil among the followers. He also sent an edict in this context to all his followers and also ordered the dais to read it out explicitly to the faithful in their respective regions. According to 'Uyun'l-Akhbar' (6th vol., p. 315), the edict of az-Zahir of 5th Shaban, 417/September 21, 1026 reads:- 'The gate of wisdom was open until our Lord al-Hakim bi- Amrillah thought it right to close it because of the prevailing circumstances and on political grounds (bi-siyasti'l jumhur). But now, continues the edict, the conditions that Commander of the Faithful has ordered the chief dai, Kassim bin Abdul Aziz bin Muhammad bin an- Noman to open the gate of wisdom to those who long for it, and to read the majalis again in the palace of the Caliphs as has been customary there before.'
S.M. Stern has published a letter found in the Geniza of the synagogue in Fustat, in which a certain dai addresses congratulation to Kassim bin Abdul Aziz