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 mosaics from the right wall of the nave depicting scenes from the life of Joshua. Above: The angel appears to Joshua; below: Rahab helps the spies to descend from the walls of Jericho; the spies report what they have seen to Joshua.
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