the commemorated saint. The Breac Maodhóg was probably used as a battle standard when it would have been carried onto the battlefield by a cleric so as to offer protection to the troops and perhaps bring victory. A medieval text on the patron saints of the kings of Leinster records that the kings of Breifne sought that "the famous wonder-working Breac [was] carried thrice around them" during battle. Cumdachs Cumdachs (or book shrines) are elaborate ornamented metal reliquary box or case used to hold Early Medieval Irish manuscripts or relics. They are typically later than the book they contain, often by several centuries. In most surviving examples the book comes from the peak age of Irish monasticism before 800, and the extant cumdachs date from after 1000, although it is clear the form dates from considerably earlier. They are mostly of Irish origin, and consist of a protective enclosures intended to permanently seal off a manuscript or relic. The usual form is a design based on a cross on the main face, with use of large gems of rock crystal or other semi-precious stones, leaving the spaces between the arms of the cross for more varied decoration. Several were carried on a metal chain or leather cord, often worn off the belt, or suspended around the neck, placing them next to the heart and thus offering spiritual and perhaps medical benefits. They were also used to bring healing to the sick or dying, or more formally, as witness contracts. Many had hereditary lay keepers from among the chiefly families who had formed links with monasteries. Although most of the extant book-shaped protective shrines are mentioned in Irish annals, they were not properly described until the early 19th century, when antiquarians and collectors such as Petrie began to seek them out from heredity collections. Most are badly damaged, including due to general wear and tear over the centuries, fires at their holding location, or more usually, having elements such as their gemstones removed for sale by their owners. A majority are now in the NMI. Croziers The NMI holds the vast majority of extant Insular croziers. There are types of processional bishop's staff (crozier) produced in Ireland and Scotland between and 1200. They can be distinguished from mainland European types by their curved crooks and drop (that is, the hollow box-like extension at the end of the crook). Symbols of office