Read the excerpt and answer the question below.
Adapted from A Tramp Abroad by Mark Twain
In the Middle Ages a most prodigious fire-breathing dragon used to live in the region, and made more trouble than a tax-collector. He was as long as a railway-train, and had the customary impenetrable green scales all over him. His breath bred pestilence and conflagration, and his appetite bred famine. He ate men and cattle impartially, and was exceedingly unpopular. The German emperor of that day made the usual offer: he would grant to the destroyer of the dragon, any one solitary thing he might ask for; for he had a surplus of daughters, and it was customary for dragon-killers to take a daughter for pay.
Who is the author making fun of in this passage?