Placed strategically at the junction of the Pho Chu and Mo Chu rivers, the dzong was built in 1637 by Zhabdrung Ngawang Namgyal to serve as the religious and administrative seat of the region. It was here that the dual system of government was introduced in the 17th century and in 1907, the first King Gongsar Ugyen Wangchuck was enthroned.