Bulfinch retells some of the stories of knights errant in the time of Charlemagne. the title is misleading - Charlemagne plays a very small part in most of the tales, does not appear at all in many and is never the central character. the stories are fantastical in the extreme, full of knights-errant whose first thought is always to fight every knight they meet, maidens in distress and enchanters. These are precisely the sort of stories that Cervantes parodies in Don Quixote - which is the only reason I read the book, which tends to get repetitive after a while.
The present book is one of three sections of a larger book by Bulfinch and appended here is an index to the whole original, so voluminous as to take up a quarter of this book.