A "Legendarium" is a collection of myths, legends, and stories that form the foundation of a fictional universe. It often includes detailed histories, genealogies, and lore that enrich the narrative and provide context for characters and events. A well-known example is the Legendarium created by J.R.R. Tolkien, which encompasses the tales of Middle-earth. In a broader sense, a legendarium can refer to any body of work that explores the cultural and historical significance of myths and legends. These collections can serve as a source of inspiration for writers, artists, and scholars, helping to preserve and share the rich tapestry of human storytelling.