A reliquary is a container for relics. A portable reliquary, or the room in which one is stored, may also be called a feretory. A brooch-like container for a very small relic may be called a "theca".
Reliquary Shrine, French, c. 1325–50, The Cloisters, New York
Inside the shrine of St. Boniface of Dokkum in the hermit-church of Warfhuizen in the Netherlands. The little folded paper on the left contains a bone fragment of Saint Benedict of Nursia, the folded paper on the right a piece of the habit of St. Bernard of Clairvaux. The large bone in the middle (about 5 cm in length) is the actual relic of St. Boniface.
Reliquary Cross, French, c. 1180
Domnach Airgid, Irish, 8th–9th century, added to 14th century, 15th century, and after
In Christian tradition, the True Cross is the original wooden cross on which Jesus of Nazareth was crucified.
Reliquary
…have wooden frameworks with gilt-copper plaques nailed on, decorated in champlevé enamel. Limoges was the largest production centre. Relics of the True Cross became very popular from the 9th century onward and were housed in magnificent gold and silver cross-shaped reliquaries decorated with enamels and…
Christ Crucified by Giotto, c. 1310
The Queen of Sheba venerates the wood from which the Cross will be made (mid 15th-century fresco by Piero della Francesca in San Francesco, Arezzo).
The Finding of the True Cross, Agnolo Gaddi, Florence, 1380
The three crosses are discovered. An injured young man is healed by the True Cross. Fifteenth-century frescoes at the Church of San Francesco, Arezzo by Piero della Francesca.