Phan Boi Chau was one of the leading figure in the anti-colonial movement in early 20th century Vietnam. (i) Vietnamese Nationalist : Phan Boi Chau was a Vietnamese nationalist and a freedom fighter. He formed the Revolutionary Society in 1903 under the leadership of Prince Cuong De. (ii) Literary Work : He wrote his world famous book, ‘The History of the Loss of Vietnam under the strong influence and advice of Cuong De. The book became a widely read bestseller in Vietnam and China. It was also made into a play. The book focused on two themes. The loss of sovereignty and the severing ties with China. (iii) His ideas regarding Freedom of Vietnam : He wanted to use monarchy in order to push French out of the country as he was of the opinion that the monarchy was still highly respected by wealthy landowners. (iv) His Work in Japan : In 1905 he went to Japan to get the Japanese assistance for the independence of Vietnam. In Japan, he started the Go - East Movement with an aim to provide western education to the young Vietnamese.