Ottoman dental book showing molars infected with toothworms. As early as Babylonian times and lasting well into the 18 century, it was thought that a toothache was caused by worms. The theory was disproved by Jacob Christian Schaffer in Tooth worms?
“La Belle Dame Sans Merci Thee Hath in Thrall” - Henry Meynell Rheam’s Painting. Here's a brief analysis of Rheam's "la belle dame sans merci". This is the only illustration of John Keats' poem, which shows the knights dream.