The book "Alfred's Treasure: A Historical Sketch" by the famous author John Earl reveals the history and meaning of one of the most famous English artifacts of the Middle Ages - Alfred's jewel. Made during the time of Alfred the Great, King of Wessex, this jewel played an important role in symbolizing royal power and unifying the Anglo-Saxon kingdoms in the 9th century. The author examines in detail the provenance, artistic value and historical context of this treasure, helping the reader to better understand its significance to English culture and history. Through John Earle's research, the book provides an in-depth overview of the era and important aspects of medieval Europe.