Treaty of Troyes
The conflict, known as the Hundred Years War, dragged on for decades. England won several famous military victories, but was unable to fully overcome French resistance. Yet in the aftermath of the Battle of Agincourt, Henry V of England, great-grandson of Edward III, became the heir to the French throne in accordance to the Treaty of Troyes. He would marry Catherine, daughter of King Charles VI of France, while Charles' son, the Dauphin Charles was declared illegitimate and disinherited.