Although fantasy had long existed in various forms around the world before his time, J. R. R. Tolkien has been called the "father of fantasy", and The Lord of the Rings its centre. That novel, published in 1954–5, enormously influenced fantasy writing, establishing in particular the form of high or epic fantasy, set in a secondary or fantasy world in an act of mythopoeia. The book was distinctive at the time for its considerable length, its "epic" feel with a cast of heroic characters, its wide geography, and its battles. It involved an extensive history behind the action, an impression of depth, multiple sentient races and monsters, and powerful talismans. The story is a quest, with multiple subplots. The novel's success demonstrated that the genre was commercially distinct and viable.

The impression of depth in The Lord of the Rings is an aesthetic effect deliberately sought by its author, J. R. R. Tolkien. It was intended to give the reader the feeling that the work had "deep roots in the past", and hence that it was attractively authentic.