Book excerpt: In Cattle Lords and Clansmen, Nerys Patterson provides an analysis of the social structure of medieval Ireland, focusing on the pre-Norman period. By combining difficult, often fragmentary primary sources with sociological and anthropological methods, Patterson produces a unique approach to the study of early Ireland—one that challenges previous scholarship. The second edition includes a chapter on seasonal rhythm, material derived from Patterson’s post-1991 publications, and an updated bibliography. The second edition includes a chapter on seasonal rhythm, material derived from Patterson’s post-1991 publications, and an updated bibliography.