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The decoration of the Early Christian churches, and particularly of the basilicas, was mostly with mosaics. The largest series of early mosaic decorations in Rome are the panels on the triumphal arch and the nave walls of Santa Maria Maggiore of c. 432-40.
The picture shows Old Testament scenes on the south wall of the nave: Moses is shown as an infant being taken into the court of the Pharaoh (above), Moses debating with scholars (below).
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