The book "When William IV was King" by the author John Ashton tells about the life and reign of the English king William IV in the period from 1830 to 1837. The short, but important for the history of Great Britain, reign of the monarch in these years is described by the author with great detail and authenticity. The book reveals the internal and external aspects of William IV's power, his relations with politicians, family and society. Written with historical accuracy and detail, Ashton's book is an important source for understanding the political and socio-cultural processes of the first half of the 19th century in England.