The Bestiary

"The Bestiary? I haven't seen that for many years. It'll be somewhere in the east wing."

- Geoffrey of Monmouth to Merlin

The Bestiary of Phylum of Cambria is a book containing information on different kinds of beasts. It is kept in the east wing of the Royal Library.

History
When Merlin went to fetch the book from the Library for Gaius, he found it on the top shelf of a very tall bookcase. While trying to retrieve it, he accidentally triggered a secret door that led to a hidden room. The room was full of magical objects, including a lead box from which Merlin accidentally released a Goblin.

Though he tried to return it to the box, the Goblin escaped into the library and pelted Merlin with books when he chased after it. One of these books was the Bestiary, which Merlin picked up before pursing the Goblin. He later forgot the book by Arthur's bed when he chased the Goblin into Morgana's chambers (Goblin's Gold).