Morten St George Theory

[-JKP-]

Very good. Nice to see it in context.

Publication date, sometime in the first half of the 14th century.  

JP, the context as it relates to the drawing appears to be entirely generic: bad faith receiving its just punishment. In 1250 (the start of the original composition per Linda), the Montségur massacre of 1244 would have been fresh on their minds.

The context is not entirely generic. If you read it, you'll see the context is a history of France (focusing on the nobility) and part of the agenda is establishing the legitimacy of the French as being an "elevated" line of peoples descending from the ancients.