“…Roberts' book is a significant contribution, both to advancing understanding of the complexities of medieval Welsh law for specialists and to explaining this subject to those who are not specialists... Roberts has organized her text and translation so that each of the 2,292 sentences is labeled with a superscript number, allowing for very precise citation by sentence in her introduction, notes, and indices. The notes comment in very readable prose on various sections of the text and also provide clear definitions for many of the specialized Welsh-language legal terms... Roberts is a fine young scholar, best known for her edition of medieval Welsh legal triads that appeared in 2007. … this is a well-written and thoughtful book which will be useful to scholars who do not know Welsh.”Frederick Suppe, Ball State University, The Medieval Review 11.11.29