The collection is the result of a consistent collection policy, over several centuries. The library was established in 1481, following a donation of 41 books. Today it consists of more than 1.5 million volumes, including 40,000 early printed books that date from before 1830, on approximately 35 kilometres of bookshelves. The library is considered one of the best Flemish heritage collections, because of its comprehensive collection and its continuity.