View of the interior of the Basilica in honour of the Virgin, built by Charlemagne at Aix-la-Chapelle, 802, and consecrated by Pope Leo III in person. (Ciampini, Vetera Monimenta, vol. ii, c. xxii, p. 129.) The roof is ornamented with painting in mosaic.
Elevation of the basilica.
Plan of the same; in its octagonal form a resemblance may be traced to St. Vitali of Ravenna.