This work presents a comprehensive collection of supplications from England and Wales preserved within the registers of the Apostolic Penitentiary between 1410 and 1503. The volumes aim to publish all such documents from the ecclesiastical provinces of Canterbury and York, starting from the earliest extant register up to the death of Alexander VI. While the primary focus is on England and Wales, the collection also includes supplications from individuals with English names residing abroad, though these were not systematically searched for.

This scholarly compilation serves as a vital primary source for historians studying late medieval England and Wales, particularly concerning religious and ecclesiastical matters. The meticulous collection of supplications offers direct insight into the concerns and petitions brought before the Apostolic Penitentiary. Its value lies in providing raw material for detailed analysis of social, legal, and religious practices of the period. The work is essential for researchers focusing on the intersection of church and state, and individual appeals within the papal system.