This work investigates the historical intersection and influence of the ius commune—the combined body of Roman and canon law—upon the development of the English legal system. R. H. Helmholz, a specialist in legal history, utilizes primary source documentation from ecclesiastical courts and historical legal records to challenge the notion that English common law developed in total isolation from continental European legal traditions. The text argues that the ius commune provided a significant intellectual and procedural framework that informed English jurisprudence during its formative centuries.

Legal historians frequently cite this work as a foundational text for understanding the continental influences on English legal development. Scholars note the high level of academic rigor and the precise use of archival evidence throughout the four studies.