From the back of the book:
"Enter the world of Arthur, King of all Britain and master of a thousand knights.
Explore the beauty and splendor of the legendary world of Camelot and the Round Table; experience its magic and mystery.
Written in a warm and entertaining style, The King Arthur Companion contains almost 700 entries, fully cross-referenced and annotated. It includes a 'who's who' of Arthurian legend; a 'what's what' of famous weapons and artifacts; a 'where's where' of many geographical locations from actual maps of ancient Britain; and a 'when's when' full chronology of Arthur's reign.
Useful with the Pendragon game or as a reference."