The book "History of the United Netherlands from the Death of William the Silent to the Twelve Years' Truce, 1604-1605" by the famous American historian John Lothrop Motley is an important source for studying the events that took place in the Netherlands during the first half of the 17th century. The author examines the period from 1584 to 1609, from the day of the assassination of the great politician William I of Orange to the signing of the Twelve-Year Armistice between the Union of Tverdingen and Spain. In his work, Motley describes in detail the important events and advisers of the time that contributed to the formation of modern borders and the political picture of Europe. The book is a very interesting source for everyone who studies the history of Europe and is interested in the political processes of past centuries.