Analysis of information sources in references of the Wikipedia article "Al-Mu'azzam Isa" in English language version.
In 1198, al-'Adil had his second son, al-Malik al-Mu'azzam 'Isa, invested as ruler of Damascus, a position that included responsibility for Jerusalem.
The other two works of public utility connected with the name of al-Mu'azzam were in fact not directly sponsored by him. One is a cistern built in 607/1210, the other a cistern and kiosk built in 613/1216-17. Their inscriptions identify their patron – i.e., the man who ordered them built – as one Muhammad b. 'Urwa b. Sayyar al-Mausili, but the inscriptions also say they were built "by the benevolence of" (min ni'mat) al-Malik al-Mu'azzam. […It] probably indicates that the prince contributed a sum of money towards the work as a gesture of piety.
Ṣahrīj al-Malik al-Muʿaẓẓam ʿĪsā. 607 / 1210-11. Cistern of al-Malik al-Muʿaẓẓam ʿĪsā
some of the second-hand material used in the arches of the facade includes the sculpted ornament taken from Crusader structures of the twelfth century […] One of the inscriptions on the porch records that the facade of the portico was constructed by the Ayyubid prince al-Mu'azzam 'Isa in c. 609/1217-18.
al-Aqsa Mosque […] the north porch was rebuilt in 1217–18 under the patronage of Salah al-Din's nephew al-Malik al-Muʿazzam.
Under al-Mu'azzam 'Isa [...] The arcade (qanatir) above the south-eastern flight of steps leading to the Dome of the Rock platform was restored (608 / 1211-12), the Nasiriyya Zawiya rebuilt (610/1214)
al-Nāṣiriyya
Al-Madrasa al-Nasriyya