William Llewelyn Davies

Sir William Llewelyn Davies (born William Davies; 11 October 1887 – 11 November 1952) was a Welsh librarian who was chief librarian of the National Library of Wales, Aberystwyth from 1930 until his death.

[1] Davies was born at Plas Gwyn schoolhouse near Pwllheli, in Caernarfonshire, north Wales.

He was a member of the Royal Garrison Artillery during the First World War and then an officer in the Army Education Service.

During his time as chief librarian, he transformed the library with a large acquisition programme, which collected and preserved many Welsh manuscripts and materials located in private hands or other collections.

He started the library's academic journal and wrote its official history.