Memorial library is located on the first floor of the eastern block of the bishop’s residence. About five thousand books from the 15th to the 20th century are stored in the library. Most of the books date from the 18th and 19th centuries. 42 book editions from the 16th century are extremely valuable with about 180 editions from the 17th century, seventy manuscripts and a particularly rich collection of dictionaries.
The library preserves works with themes from church and general history, theology, dogmatics, law, economics, missals and rituals of Eastern and Western rites and linguistic treasures. One of the oldest and most valuable books in the collection is the Missalum Zagrebiensis from 1506, printed in Venice.