Last week we asked: In Lord of the Rings, the Fourth Age technically began when what Master departed Middle Earth?
The answer is Master Elrond. Tolkien says that the Third Age ended with the War of the Ring but the Fourth Age did not begin until Elrond departed. "And the time was come for the dominion of Men and the decline of all other 'speaking-peoples' in Middle-Earth."
Next week's trivia question: In Sue Dent's book, Never Ceese, what is the name of the main character?