How did Henry V become involved in the war against Welsh rebels?

Henry V’s involvement in the war against Welsh rebels began shortly after his father, Henry IV, ascended the throne. In October 1399, Henry was created Prince of Wales, and by October 1400, the administration of Wales was conducted in his name.1

As the rebellion led by Owain Glyn Dŵr intensified, Henry took active command of the military campaign against the insurgents in 1403. This conflict became a primary focus of his efforts for several years, during which he worked to suppress the uprising and reclaim territory. By 1405, Henry had achieved significant military success, twice defeating Glyn Dŵr in battle, and by 1408–1409, he had successfully captured the rebel leader's main strongholds. This period of warfare served as a significant outlet for his energies before he began to take a more prominent role in the broader government of England.12