A friend just sent me a note asking if I could recall "an engraving of
the late c 16th that shows St George on horseback killing the dragon and
provides an allegorical key to it in terms of Protestantism and the
Catholic Church." I can think of a number of plain St George and dragon
images, but none with such an allegorical key -- this reminds me more of
illustrated versions of Revelations. Any thoughts?