Image: Construction of a Medieval Church in Santiago, Charlemagne Window - Chartres Cathedral, France

Charlemagne orders the construction of a church with flying buttresses, on which masons are shown working. This may represent an expansion of the existing church at Santiago de Compostela or the founding of the monastery church dedicated to Saint Facundus and Saint Primitivus. Stained glass panel 13 of the Charlemagne Window, Chartres Cathedral. Chartres, France.