For many people, the English writer JRR Tolkien (1892-1973) is above all the author of the Lord of the Rings, the film series directed and produced by Peter Jackson from 2001 to 2003. But what most people are unaware of is that this immensely successful novel is only the tip of a monumental corpus, started in the 1910s, and which Tolkien pursued to the day he died in 1973. Even...