The Silmarillian was edited and published by Tolkien's son, Christopher.
Mabel Tolkien died in 1904 of acute Diabetes.
Posthumous Book- A book published after the authour's death.
Agatha Christie was working on her autobiography at the time of her death in 1976. The book was titled "An Autobiography" and was published posthumously in 1977.
JRR Tolkien ( John Ronald Reuel Tolkien) died on September the 2nd, 1973, at age 81.
As a matter of fact, he had three sons. These were John Tolkien, Michael Tolkien, and Christopher Tolkien. His third son, Christopher, is the most famous, because he compiled and published several works that J.R.R. Tolkien had died without releasing. Much of what we know about the early history of Middle-earth we owe to him.
"Hooray For Diffendoofer Day!", published in 1998, was written after Dr. Seuss's death, based on his sketches and notes. It was finished by Jack Prelutsky and illustrated by Lane Smith. Dr. Seuss (aka Theodor Seuss Geisel) passed away in 1991.
JRR tolkien knew around 35 diffrent languages.
Mabel Tolkien died on November 14, 1904, in Rednal, West Midlands, England, UK of diabetes.
Tolkien died on 2 September 1973. He was buried next to his wife Edith.
Michael Tolkien died in 1984, in England, UK.
Tolkien was 12 years old when his mother died. His guardian was a Catholic Priest.
J.R.R. Tolkien died September 2, 1973 of natural causes at age 81.