Hey diddle diddle, a tax and a riddle

From "Humpty Dumpty falls from favour":

Jack and Jill has several possible origins. It may mark King Charles l’s unsuccessful attempts to reform the taxes on liquid measures, Jack being half a pint and Jill being a quarter of a pint, or gill. Although the King’s measures were blocked, he subsequently ordered the volume standard measures to be reduced, while the tax remained the same

Humpty Dumpty was originally posed as a riddle, as “humpty dumpty" was 18th-century slang for a short, clumsy person, who might well be the kind to fall off a wall Similar riddles have been recorded in other languages, such as Boule Boule in French, or Lille Trille in Swedish

Ring a Ring o'Roses was usually accompanied by a playground skipping game that ended with children falling down and is said have originated with the Great Plague in 1665. Some experts dispute this, pointing out that European and 19th-century versions suggest that this “fall” was not a literal falling down, but a curtsy