Clerestory

Holy Trinity church, Bledlow. The clerestory is the section with groups of three windows above the side aisles in the central portion of the church.Uppermost part of the nave, above the level of the side aisles, pierced by windows to let more light in. Not all churches have clerestories and in many churches, clerestories were a later addition. Clerestories are also high-level windows in secular buildings.