The "Book of Lismore" (original name: "Leabhar Mhic Cárthaigh Riabhaigh", meaning "The Book of Mac Cárthaigh Riabhach"), a compilation of medieval Irish manuscripts mainly relating the lives of Irish saints, notably St Brigid, St Patrick, and St Columba, also contains "Acallam na Senórach", a most important Middle Irish narrative dating to the 12th century, pertaining to the Fenian Cycle. The "Book of Lismore" and the Lismore Crozier (an enclosure for an episcopal staff, believed to be the venerable oaken staff of the founder of the abbey), were discovered together in 1814 behind a blocked-up doorway in Lismore Castle. Today, the castle continues in the private ownership of the Dukes of Devonshire who open the gardens and parts of the grounds for public access via a changing programme of local arts and education events. The "Book of Lismore" is on display at Chatsworth House in Derbyshire, Great Britain, and the Lismore Crozier is in the National Museum of Ireland in Dublin.