Led Zep and LOTR

I am a big fan of Led Zep and LOTR. Couple of minutes ago I was listening to "Battle Of Evermore" which happens to be one of my fav song from LedZep. In the song there is a line which refers "the ringwraiths". Now I have been listening to this song since years, but never before it occurred to me that it will have anything to do with LOTR. I open Google and give a search for "Led Zep + Lord Of The Rings + Battle Of Evermore" and this is what I get.

Apparently LedZep were heavily into LOTR and very much influenced by Tolkien's work.