These kinds of delusion is known as being:
paranoid
When a person is being paranoid, he or she can not stop thinking of negative happenings or thoughts that may happen to him or her. These type of persons are suffering from the mental condition commonly known as paranoia
Thus, the answer is:
paranoid
Feudalism was essentially a monarchy. It had social classes. It replaced the old courts of a land with ones controlled by the king.
