San Teodoro (St. Theodore) was the original patron saint of Venice and even though he was replaced by San Marco (a much more prestigious saint), there are still images of him around Venice both outside on the streets and in paintings inside churches. The most famous is the sculpture that shows him standing on a crocodile/dragon on top of the huge column in the Molo. That's him on the right.
San Teodoro was a dragon-fighting saint. There are so many images of San Giorgio fighting the dragon all over Venice and I wonder, how do you tell the difference between George and Theodore? And don’t forget San Donato, another dragon fighter, as well as Archangel Michael who can be seen fighting a dragon on a mosaic inside San Marco. I wonder if some of the images identified as San Giorgio might be Teodoro instead.
Here are a couple that ARE supposed to be San Teodoro. The first is on the side of the Scuola di San Teodoro, the second is on the façade of the church of San Toma.
Below is a view of Campo San Salvador by Canaletto. The church is on the left and the scuola to the right. This painting can be seen in an exhibit at the National Gallery of Art in Washington, DC. This show runs from February 20–May 30, 2011; I'd love to see it but am not sure I'll be able to get there.
San Teodoro's relics are in the church of San Salvador to the right of the high altar. In 2008, I could see his body in a glass coffin, and he was wearing a very vivid silver mask. I'd never seen anything quite like it. But when I visited in November, they had blocked the view with a gold panel. Perhaps they only open it up on special occasions? There's a photo of the saint and the mask on this website, Il Tesoro di San Salvador.
A vintage photo showing the columns~