 A large portion of their works seems to have perished in the destruction of Cairo's famed libraries which followed the collapse of the Fatimid state in c. 1171.Ibn Hani's diwan, apart from surviving, has been the subject of research for many scholars like Zahid Ali, Farhad Daftary and M. Canard, the author of the French book "L'imperialisme des Fatimides et leur propagande".Zahid Ali has edited the Diwan and elaborated the verses in his thesis "Tabyeen al Ma'ani fi Sharh Diwan Ibn Hani" for which he has received the Doctorate of Philosophy from the Oxford University in London.