The Book of Irish Saints likely refers to a book that provides summaries of the lives and accomplishments of famous Irish saints, such as Saint Patrick, Saint Brigid, and Saint Colmcille, often including folklore, legends, and miracles associated with them. These books aim to provide insight into Ireland's history and religious heritage, highlighting not only the saints' good qualities but also their human experiences, including their hardships and failings.If, during the Middle Ages, the Irish more or less fade out of the intellectual life in Europe, the Irish heritage was preserved. Irish saints were invoked as before. Their feasts are found in many a late medieval calendar, and their popularity can be measured by the great number of guilds and religious brotherhoods that made them their patrons,