Final answer:
The monarchies that fought intermittently during the Hundred Years' War were England and France. The war lasted from 1337 to 1453 and was primarily a conflict over the succession of the French crown.
Step-by-step explanation:
The monarchies that fought intermittently during the Hundred Years' War were England and France. The war lasted from 1337 to 1453 and was primarily a conflict over the succession of the French crown. England's king, Edward III, claimed to be the rightful heir to the French crown, leading to a century-long war between the two kingdoms. Although France had a larger population, England's disciplined infantry armies often had the upper hand in battle.