St Lawrence Mosaic in the Mausoleum of Galla Placidia05

Mosaic of St Lawrence on a lunette in the Mausoleum of Galla Placidia in Ravenna

The gridiron is the symbol of martyrdom of St Lawrence. The mosaic on the southern lunette of the Mausoleum of Galla Placidia in Ravenna dates from the early fifth century.