OK, I admit it, in the end I didn’t read all 848 pages. Some of the kingdoms were just too obscure, the characters too interchangeable, and the permutations too complicated (Burgundy, I’m thinking of you) to prevent my eyes glazing over. But where I did know something about the background history, Davies was downright brilliant. In particular, the chapter on Alt Clud, the Kingdom of the Rock, that endured upon the twin humped lump of granite overlooking Dumbarton for four centuries during the Early Medieval period was wonderful. It brought the old British kingdoms vividly to life, and was worth the price of the book (or at least the reservation charge at the library) on its own. So, particularly recommended for periods and places that you know a little about, and want to learn more about.