Prakhar Lhakhang was built at the end of the 16th century by Tenpe Nyima (born in 1569) who was the grandson of Pema Lingpa, a saint of Nyingmapa school (1450-1521). According to the legend, Tenpe Nyima received a prophecy saying that he should build a temple in the lower Chhume valley where two rivers meet next to a black rock. As he undertook the task, the temple somehow seemed to grow bigger every night, and the villagers observed white monkeys working on the temple after dark. The name of the place Prakhar which literary means, “white monkey” is derived from this story. The first building of the temple, called Zha Lhakhang, built in the 16th century, has three storeys with the upper storey containing beautiful 16th century paintings of the life of Padmasambhava. Today Prakar Lhakhang is one of the sightseeing places in Bumthang. The Lhakhang performs annual Prakhar Duechoed or Tshechu which is performed over 3 days.

Source —Heavenly Bhutan Travel