Explore the world of royalty with "The Royal Encyclopedia" authored by Ronald Allison and Sarah Riddell. This hardcover book published in 1991 by Macmillan Publishers Limited is a must-read for all history enthusiasts. Learn about the lives of kings and queens, their customs and traditions, and the impact of their reign on their respective countries. The book is written in English and covers all aspects of royalty. Get your hands on this fascinating book and delve into the world of the royals.