A resident of Elopain village in the Ithun Valley, Lohit District, North-East Frontier Agency (Arunachal Pradesh), Taji Mideren was a farmer and trader. He took part in the activities against British rule and killed three British officers near the Dikran river in 1905. He organized his Mishmi fellow tribals and got them to come together to resist the expansion of British authority. He established a Mishmi Confederacy under Pangon and other Mishmi leaders. A British expedition was sent to his village in 1913 to arrest him for the murder of the three British officers. The British burnt down the houses in the village but failed to arrest him and others. He was finally captured by the British police at Sadiya in December 1917, and was deported to Tezpur in Assam. There he was tried and sentenced to death. He died on the gallows in the Tezpur Jail on January 29, 1918.