The Horrible Histories series was primarily written by Terry Deary, a British children's author known for his humorous and engaging approach to history. Deary has written over 350 books, and Horrible Histories is his most famous work, praised for inspiring children and adults alike with entertaining historical facts presented with wit. The series also involved Peter Hepplewhite and Neil Tonge as co-authors, with illustrations by Martin Brown and others. Terry Deary started the series in the early 1990s, combining humor with factual history to create a unique genre of children's non-fiction books. His distinctive style and dedication have made Horrible Histories a beloved and successful series worldwide, selling millions of copies in multiple languages and spawning TV adaptations and stage shows.