He that hath kill’d my king and whored my mother,
Popp’d in between the election and my hopes,
Thrown out his angle for my proper life.

– William Shakespeare

Hamlet, Act 5, Scene 2. Hamlet’s grievances with Claudius in a nutshell. He killed his father, turned his mother into a whore, prevented Hamlet from ascending to the throne, and then tried to have him killed.