William Terence Deary (born 3 January 1946) is a British children's author of 351 books, selling over 38 million copies in over 45 languages, best known as the writer of the Horrible Histories series. Since 1994 he has been one of Britain's best-selling authors. In 2012, he was the tenth most-borrowed author in British libraries, and was voted Outstanding Children's Non-Fiction Author of the 20th Century by Books for Keeps magazine.

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