The book "History of England, Period I. Medieval Monarchy" by James Frank Bright is a detailed study of the formation and development of the monarchy in medieval England. The author covers the period from ancient times to the end of the medieval era, examining the key events, important political figures and cultural trends of the time. Bright successfully combines an analytical approach and scientific background with an interesting and neat writing style, which makes the book "History of England, Period I. The Medieval Monarchy" not only a useful source of information, but also a fascinating read for anyone interested in the history of England during the Middle Ages.