megalomania

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Yet this very megalomania seems to be both the secret to his longevity and to his unhinged nature.
然而，极度的狂妄自大似乎正是他长久统治和错乱心智背后的原因。
It seems that there is something advantageous in the megalomania that is his defining lifelong trait.
狂妄自大正是他长久统治的关键，看起来，这样的品质似乎有些好处。
But it is fairer to think of him as just a moderately violent thug with a touch of megalomania, whose goons club rivals, who closes newspapers, harasses judges and bans public meetings.
公平来讲，它不过是一个有些狂妄自大的温和派激进分子，他的爪牙都是纠集在一起的，与传媒联系紧密、能够枉法裁判以及禁止公共集会的部纵。

His megalomania did him in eventually, but at least he stopped the chaos for a while.
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an unnaturally strong wish for power and control, or the belief that you are very much more important and powerful than you really are

Megalomania is the belief that you are more powerful and important than you really are. Megalomania is sometimes a mental illness.