Radio 3's twenty part essay series on the Islamic Golden Age continues its exploration through this five hundred year period of empire, innovation, religious turmoil, scientific discovery and major advances in philosophical thought. In this evening's essay, we hear about the controversial Egyptian imam-caliph, Al Hakim and his sister Sitt al-Mulk. At worst, al Hakim has a reputation as the "mad" caliph and the destoroyer of the Holy Sepulchre church in Jerusalem. At best - he's a capricious tyrant. Dr. Simonetta Calderini and Dr. Delia Cortese share their forensic academic research into these controversial siblings and the essay is read by Dr. Simonetta Calderini.

Producer: Sarah Taylor.