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The 5th century Byzantine Column of Marcian displays the XI monogram inside a wreath.
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Detail of IX monogram on Constantinople sarcophagus, end of 3rd, early 4th century.
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Cover of Merovingian sarcophagus, Musée de Saint-Germain-en-Laye. File:Merovingian sarcophagus symbol 6th 7th century Paris.jpg