premise: Middle-earth is part of the Lord of the Rings legendarium.
hypothesis: Aragorn II , son of Arathorn is a fictional character from J. R. R. Tolkien 's legendarium . Middle-earth is the fictional setting of much of British writer J. R. R. Tolkien 's legendarium . Tolkien 's most widely read works , The Hobbit and The Lord of the Rings , take place entirely in Middle-earth , and Middle-earth has also become a short-hand to refer to the legendarium or its fictional universe .