Memoirs of Sir Cabirus

Memoirs of Sir Cabirus comes with Ultima Underworld I. It is 30 pages long. In-game, Corby, the scribe of Sir Cabirus, is the author of the book. In real-life, W.G. Armintrout has written the book.

The following topics are part of the book:
 * The proclamation
 * History of Britannia
 * Inhabitants of The Abyss
 * The classes
 * Runic Magic
 * Bestiary
 * Afterword

The book is intended to put Sir Cabirus' work in a positive light. Therefore, the Abyssal colony is painted in better colors than it actually ever had been, although the afterword makes it clear that in the end, everything had broken down.