These architectural features are semicircular or polygonal spaces extending from the ambulatory or chevet of a church, particularly common in Romanesque and Gothic cathedrals. They served as individual spaces for altars dedicated to various saints and relics, allowing for multiple simultaneous services and veneration by pilgrims.
The development of these structures significantly increased the capacity of churches to accommodate large numbers of visitors drawn by the presence of holy relics. This, in turn, fostered economic growth in the surrounding communities. Furthermore, the design provided opportunities for architectural innovation and the incorporation of complex sculptural programs that enhanced the spiritual experience.
