Charles VI of France, also known as Charles the Mad, was born in 1368 and became king in 1380. His reign was marked by periods of mental illness, which led to instability in the French monarchy. Despite his challenges, he was involved in significant events, including the Hundred Years' War against England. During his reign, Charles VI attempted to maintain peace through treaties, such as the Treaty of Troyes in 1420, which recognized Henry V of England as his heir. However, his mental health issues and the ongoing conflict weakened his authority, leading to a power struggle among the nobility and contributing to the eventual decline of the Valois dynasty.