Emperor Duy T?n (Nguy?n Ph?c V?nh San, 14 August 1899  25 December 1945), was a child Emperor of the Nguy?n Dynasty and reigned for nine years between 1907 and 1916. His name was Prince Nguy?n Ph?c V?nh San and was son of the Th?nh Th?i Emperor. Because of his opposition to French rule and his erratic, depraved actions (which some speculate were feigned to shield his opposition from the French) Th?nh Th?i was declared insane and exiled to V?ng T?u in 1907. The French decided to pass the throne to his son Nguy?n Ph?c V?nh San, who was only seven years old, because they thought someone so young would be easily influenced and controlled, and could be raised to be pro-French. This proved to be a big mistake on the part of the French. Nguy?n Ph?c V?nh San was enthroned with the reign name of Duy T?n, meaning 'friend of reform' and in time would prove unwilling to live up to this name. As he became older he noticed that, even though he was treated as the Emperor, it was the colonial authorities who were actually obeyed. As he became a teenager, Emperor Duy T?n came under the influence of the mandarin Tr?n Cao V?n, who was very much opposed to the colonial administration. Emperor Duy T?n began to plan a secret rebellion with Tr?n Cao V?n and others to overthrow the French. In 1916, while France was preoccupied with fighting World War I, Emperor Duy T?n was smuggled out of the Forbidden City with Tr?n Cao V?n to call upon the people to rise up against the French. However, the secret was revealed and France immediately sent troops, and after only a few days they were betrayed and captured by the French authorities. Because of his age and in order to avoid a worse situation, Emperor Duy T?n was deposed and exiled instead of being killed. Tr?n Cao V?n and the rest of the revolutionaries were all beheaded.