Until comparatively recently Welsh historical works were uncritical; and although many of them contain much invaluable information, they must be read with caution. Welsh historical scholarship has, however, made great strides recently, and now there are a few excellent books available, more especially for the Middle Ages. For the later period the most valuable material is still scattered about in old numbers of such publications as the _Cymmrodor, Transactions_ of the Cyminrodorion Society, and the Cambrian Archæological Society, _Cymru Traethodydd_, _Y Geninen_, _Eisteddfod Transactions_, etc.; and locked up in theses written for the post-graduate degrees of the Welsh, and other, Universities. A historian with ability to digest, and above all ability to write, is badly needed to deal with this immense volume of material. The best general introduction is O. M. Edwards's _Wales_, in the "Story of the Nations" Series. It is delightfully written, and is always interesting and suggestive. Another good book is Rhŷs and Brynmor Jones's _The Welsh People_. Gilbert Stone has written an interesting book, _Wales_, especially valuable for the pre-Norman period. For the Middle Ages the standard work is Lloyd's _History of Wales_, in two volumes. It is scholarly and accurate, but unfortunately only takes us down to the Edwardian Conquest. Haverfield's _Roman Britain_ is useful. Seebohm's _Tribal System in Wales_ adopts some exploded theories, but is still essential. Little's _Mediæval Wales_ is brilliant and suggestive. Barbier's _Age of Owen Gwynedd_ is interesting. Morris's _Welsh Wars of Edward I_ is valuable for much besides military affairs. Hugh Williams's learned work on _Christianity in Early Britain_ should be consulted. Other books of interest are Peake's _Bronze Age and the Celtic World_, and Lewis's _Mediæval Boroughs of Snowdonia_. Always brilliant, though not always reliable, is Rhoscomyl's _Flame Bearers of Welsh History_. Good biographies of mediæval Welshmen are few. Henry Owen's _Gerald the Welshman_ is good; also Bradley's _Owen Glyndwr_. Tout's _Edward I_ should be consulted, also Wade Evans's _St. David_.