For whom was the Leviathan written? How do you know?

Thomas Hobbes was the author and it was written in connection with the English Civil War and the decline of monarchy who was torturing the people. His book is a critique of his time and the civil state. He is very pesimistic about the nature of humans-the humans are evil in nature so they deserve to be under a tyrant who to control them. Basically, defending the monarchy such as a tool which existence is needed in order to control the evil humans.