The library was founded by Federic III in 1648 and in 1673 a building opposite the Christiansborg Castle was specially allocated for it. The foundation of the collection was four private libraries acquired by the enlightened monarch. Over the next centuries, the library was actively replenished through new acquisitions, gifts, as well as military trophies. Starting in the 17th century, the law guaranteed the delivery to the Royal Library of copies of all publications printed in Denmark. The Royal Library currently consists of 500,000 volumes and 20,000 manuscripts; between the latter is a remarkable collection of manuscripts in Sanskrit, Pali and Sinhalese. In September 1999, a new library building was opened, which received the poetic name "Black Diamond".
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