The book "An Inquiry into the Truth of the Tradition of the Discovery of America by Prince Madog ab Owen Gwynedd about 1170" by John Williams is an interesting scholarly study that examines a little-known theory about the possible discovery of America in the twelfth century. The author analyzes in detail the legend of Prince Madog ab Owen Gwynedd, who, according to legend, went west and discovered an unknown land, which, according to some, could be an ancient description of America. John Williams examines the various arguments and documentary evidence that support the possibility that Prince Madog ab Owen did indeed travel to what we now call America. The book contains a thorough study of historical sources, legends and archaeological evidence supporting this theory. The author offers readers to review the known facts about the discovery of America with an unexpected perspective and the possibility of a new interpretation. "An Inquiry into the Truth of the Tradition of the Discovery of America by Prince Madog ab Owen Gwynedd about 1170" is a fascinating and informative read for anyone interested in the mysterious history of the world.