Jan Terlouw (b. 1931) made his debut as an author of children’s books in 1970. He was for many years the leader of D66, the left-wing liberal party. His social conscience can be seen in his books, in which he often considers current issues in his exciting, vivid writing style. Terlouw’s work was twice awarded the Golden Slate Pencil, has been translated into 17 languages and has never been out of print since publication. Koning van Katoren has been reprinted 54 times; over 350,000 copies have been sold. The book was turned into a successful musical in 2000. The film rights have been sold to Kasander Film Company.