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Histoire de l'art par les monuments...

Plan of the Church of S. Martino ai Monti at Rome. Example of a church erected over a subterranean oratory. Fourth century

1. General plan of the Church of S. Silvestro and S. Martino ai Monti, erected over the Oratory of S. Silvestro.

2. Enlarged plan of the Confession.

3. Plan of the ancient church of S. Silvestro, at the side and below the Confession.

4. Section of the Oratory of S. Silvestro.

5. Portion of an antique cornice, preserved in the Church of St. Nereus and Achilleus.

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