Tolkien is buried together with his wife Edith, and their graves are marked with the names “Beren” and “Luthien”. The tale of Beren and Luthien was inspired by the Tolkiens’ own story.
A Brief History of Tolkien
The following documentary is an excellent short history of Tolkien’s life and the development of his work. The segment on Beren and Luthien starts around 12:45 into the video.