The Clemency of the Emperor Trajan
Chiesa San Vidal, Venice, Italy
The painting presents the moment when Trajan replies to the woman seeking justice that he needs to leave immediately on a military campaign (as suggested by the horse and tent on the left).
Chiesa San Vidal is actually a concert venue, but it still goes by its the name it bore when an active church.
This image in full resolution
For more about Trajan's story, see this section of the page on St. Gregory's iconography.
Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.