File:Crypte.Saint.Seurin.Bordeaux.png

...Dans beaucoup de cryptes de petite dimension, le corps saint occupait une sorte de niche ou d'absidiole construite ou creusée à l'extrémité orientale; alors les fidèles, en descendant les escaliers, se trouvaient en face du corps saint comme devant un autel placé au fond d'une chapelle. La crypte de Saint-Seurin de Bordeaux, qui date du XI^e siècle, est construite d'après ce principe...

This image comes from Dictionary of French Architecture from 11th to 16th Century (1856) by Eugène Viollet-le-Duc (1814-1879).

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