Allegorical Figure of a Woman with a Shield or a Mirror (Prudence?)

The question mark in the title is the museum's own. Tiepolo painted this woman and her companion in a narrow range of greys, so that from a distance they look like reliefs of marble or stucco set against gold. Because the ovals were meant to be seen high up on the walls of a Venetian palace, he did not trouble to make the figures easy to identify. She points at an oval object that could be a shield or a mirror. A mirror is the traditional attribute of Prudence, and so the Rijksmuseum offers that name, with a query attached. The pair came to the museum in 1941 in the bequest of the Amsterdam collector Julius vom Rath, together with more than 300 other objects.