Imaam Ibn Katheer (rahimahullaah) said: He [Ibnul Mu-izz (411AH)] was a despot and a rebellious devil.
Some of his ugly characteristics and cursed way of life
There was much instability in his actions, judgements and statements. He claimed Uloohiyyah (i.e. to be deified and worshipped) just as pharaoh did. He used to command the people to stand up in rows to exalt his mention and show respect to his name when his name was mentioned by the khateeb on the pulpit. This was done in all the places under his ruler ship.
He commanded the people of Egypt in particular that they should prostrate when his name is mentioned. And even those people in the markets and those who did not establish the five daily prayers and the Juma’ah Friday prayer used to prostrate when his name was mentioned. They used to abandon prostration for Allaah on Fridays (i.e. they did not attend the Friday prayer) and (the prayer) on other days, but they prostrated to the ruler (i.e. Ibnul Mu-izz).
He used to command the Jews and Christians to embrace Islaam whilst they hated to do so, and thereafter he permitted them to return to their religions. He used to destroy their churches and synagogues and rebuilt them again. Then he would kill them, destroy their churches and synagogues.
He forced the people to close the markets during the day and open them at night. This command was obeyed for a long period until he came across a man -several times- who was engaged in carpentry in the last hours of the day; so he approached him and said: “Have you not been forbidden (i.e. from working during the day)?” He (i.e. the man) said: “O my Sayyid! When the people seek after their livelihoods during the day, they would stay up late during the night (in pursuit of their livelihoods); and when they seek after their livelihoods during the night, they would stay up late during the day (in pursuit of their livelihoods). This this is a part of staying up late.” He (ibnul Mu-zz) laughed and left him, and thereafter he returned the people to their previous affair (i.e. work during the day).
[Source: For further details, see: Shaikh Muqbil’s (rahimahullaah) Book titled: Ilhaadul Khumeini Fee Ardil Haramayn page: 163-168]