sentences:  His connection with Sir John Williams was important in the history of the establishment of the National Library.In 1915 he completed the publication of a two volume set of the works of the 6th-century Welsh poet Taliesin.The first volume, the "Facsimile & text of the Book of Taliesin", is a complete photographic facsimile of the original manuscript (c.1275–1325) with a scholarly introduction and notes.