The study, written by a famous French historian, was published in Russian translation back in the 30s. twentieth century, but still remains one of the brightest and most comprehensive works devoted to the history of the formation and strengthening of two closely related medieval monarchies - England and France. Covering the period from the end of the 10th century until the proclamation of the Magna Carta, the author presents his view of the past, allowing us to understand the essence of events that had a colossal impact on the entire subsequent history of Europe.