What is the purpose of the chapels along the sides of the apse?
The apse (the end opposite from the entrance) has radiating chapels where pilgrims could pause to pray and admire important relics.
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A. Aisle - Aisle, portion of a church or basilica that parallels or encircles the major sections of the structure, such as the nave, choir, or apse (aisles around the apse are usually called ambulatories). The aisle is often set off by columns or by an arcade.