Santa Pudenziana
Constantine's conversion to Christianity lead to extensive building of Christian basilicas in the late 4th century, in which floor, wall, and ceiling mosaics were adopted for Christian uses. The earliest examples of Christian basilicas have not survived, but the mosaics of Santa Constanza and Santa Pudenziana, both from the 4th century, still exist. In another great Constantinian basilica, the Church of the Nativity in Bethlehem, the original mosaic floor with typical Roman geometric motifs is partially preserved.