Besides being a patron of dramatists (in Wales and London) and musicians, e.g. his association with Josef Holbrooke in the production of The Children of Don and Dylan, he was himself a writer, the Arthurian cycle giving him the subject of his first play, and, later, the folklore of Wales providing him with material for operatic libretti. Among his works are: Children of Don (1912), Pont Orewyn (1914), Lanval (1915), Dylan (1919), The Cauldron of Annwn (1922), The Cauldron of Annwn, including the story of Bronwen (1929), Five Pantomimes (1930), Song of Gwyn ap Nudd [1913]. He had previously published Banners, standards, and badges: from a Tudor manuscript in the College of Arms, and Some feudal lords and their seals, both in 1904. His last full-length play, which dealt with the emperor Heraclius and his relations with both Christianity and Islam, was produced in 1924. He was awarded the degree of LL.D. honoris causa by the University of Wales, was President of the Nat. Museum of Wales and a governor of the Nat. Library of Wales. In 1938 he became a trustee of the Tate Gallery. He d. 5 Nov. 1946 in London.