Jesus and the Evangelists
Museo Pio Christiano, Vatican City
The figure waving to the rowers and holding an oar is identified as Jesus by the label to his right. The other rowers, right to left, are labeled as the evangelists Mark, Luke, John, and presumably Matthew on the part that is now lost. The image does not of course record any historical moment, as Mark and Luke came into the Christian community only after the Ascension of Christ. Thus it is symbolic, but of what I am not sure.
This image in full resolution
More of the evangelists as a group
Photographed at the museum by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.