Dzongs were first built in Bhutan in the twelfth century by La, Gyalwa Lhanangpa, an important leader of the Lhapa Kagyu. Do Ngon Dzong (Blue Stone Dzong) where Dechen Phodrang stands today was built by him. It was only from the time of Zhabdrung Ngawang Namgyal in he seventeenth century that the Dzong played a significant role in the history of Bhutan.They not only served as an effective defence but also became the centers of religious and cultural activities and the seat of civil authority.
Today the major Dzongs are the seats of district administrations. They house the offices of the civil authority headed by the Dzongda and district court headed by the Thrimpons.

