This volume presents a collection of primary source documents related to the activities of Cardinal Guala Bicchieri during his tenure as papal legate in England. The letters and charters offer direct insight into the political and ecclesiastical landscape of England between 1216 and 1218, a period of significant upheaval following the death of King John. Guala Bicchieri's role was crucial in navigating the complex relationships between the papacy, the English monarchy, and the baronial factions, and these documents serve as the foundational evidence for understanding his influence and the broader historical context.

The collection serves as a vital resource for scholars specializing in medieval English history and papal relations. Its value lies in providing direct access to primary source material, allowing for in-depth analysis of the period's political and religious dynamics. The documents are essential for understanding Cardinal Guala Bicchieri's significant, though often complex, role during a turbulent era. The publication is therefore primarily of interest to academic researchers and institutions.