The library holds the largest collection of books in Wales, 50,000 theses and dissertations and 800,000 photographs connected to Wales.
The library is also home to the Welsh Literature Archive and the National Screen and Sound Archive of Wales.
The building on Penglais Hill was first occupied in 1916 but a campaign to develop a national library for Wales dates back to the 18th century.
A committee was set up to collect Welsh material and campaigners, including MPs, worked hard to establish a National Library and a National Museum.
Aberystwyth was chosen for Wales’ national library and Cardiff was decided on the venue for the museum.
A Royal Charter established the library and museum in 1907 and work started on the building the library in 1911.
The building has been extended several times since then including the creation of a large storage building in 1996
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