Baptistry of Saint-Jean of Poitiers
The Baptistry of St. Jean at Poitiers (sixth century) has the form of a rectangle flanked by three apses. The original building has probably undergone a number of alterations but preserves in its decoration (marble capitals) a strong Merovingian character.
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"312 Poitiers baptisterio."
http://en.wikipedia.org/wiki/File:312_Poitiers_baptisterio.JPG
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