Events that occurred on 13 April.
 On Earth
- 1902 - Voice actor Godfrey Kenton is born.
- 1937 - J.R.R. Tolkien writes Letter 12.
- 1944 - J.R.R. Tolkien writes Letter 60.
- 1970 - Tom Shippey receives a letter from J.R.R. Tolkien after giving a speech at a Tolkien-themed convention.
- 2000 - Another edition of Tolkien: The Illustrated Encyclopedia is published.
- 2005 - German translator Wolfgang Krege dies.
 In Arda
- T.A. 2510:
- T.A. 3018:
- In the morning Gandalf examines Bilbo's Ring and determines from its inscription that it is the One Ring. He tells Frodo of the Ring's history and Frodo volunteers to leave the Shire in order to secure the Ring.
- Samwise Gamgee is caught by Gandalf eavesdropping, and is (happily) obliged to accompany Frodo.