The 10 year old king who declared war on adults.

There is no historical record of a 10-year-old king who specifically declared war on adults. However, there are instances of very young monarchs in history who have ascended to thrones at young ages and have been involved in conflicts:

- **Henry VI of England** became king at the age of 8 months in 1422 and was later crowned King of France as well due to the Hundred Years' War. He didn't declare war on adults, but his reign was marked by significant conflict, including the loss of French territories and the War of the Roses.[](https://www.mentalfloss.com/article/12252/11-monarchs-crowned-while-they-were-diapers)

- **Edward VI of England** ascended the throne at the age of 9 in 1547. His reign was dominated by the power struggles of his regents and advisors, leading to religious and political turmoil, although there was no declaration of war specifically on adults.[](https://www.history.co.uk/articles/britains-youngest-ascending-monarchs)

- **Tutankhamun** of ancient Egypt took the throne at around 9 or 10 years old. His reign saw the reversion of religious policies instituted by his father, but no recorded war against adults specifically.[](https://www.historyanswers.co.uk/kings-queens/five-child-monarchs-who-changed-history/)

These examples show that while child monarchs have been central to historical conflicts due to their positions, none fit the specific narrative of declaring war on adults. If you're referring to a fictional or metaphorical account, please clarify for more accurate information.