 The office of the Drungpa (sub-district administrator) is also housed in the Dzong.The Dzong was built in 1668 by the third Desi of Bhutan, Chögyal Minjur Tenpa (r. 1667-1680) to commemorate victory over a Tibetan invasion and named Yügyal Dzong.It controlled the border between Tibet and Bhutan and was one of the main defensive fortresses in the north of Bhutan.