“The Battle of Evermore” is inspired by The Lord of the Rings by J. R. R. Tolkein. The song was released as a Celtic folk duet with Robert Plant and Sandy Denny. To thank her for her participation, Denny also has her own Led Zeppelin IV symbol featured as an asterik after “The Battle of Evermore” on the inner sleeve of the album. The symbol, which includes three upside down triangles stacked triangularly (two on the bottom and one centerrd atop), is thought to be a Christian symbol for the Godhead.