The product is a hardcover textbook titled “Kings, courtiers & imperium: the barbarian West, 565-725 / P.S.” authored by P. S. Barnwell. Published by Bloomsbury Publishing in 1997, the book delves into the political science of the barbarian West during the period of 565-725 AD. With a focus on history and written in English, the book spans 256 pages and provides valuable insights into the dynamics of kings, courtiers, and imperium in this time period.