It is believed that Chak-Darra is the birth-place of the great Buddhist Scholar Padma-Sambhava. Chak-Darra is the village which is now in Lower Dir, Swat valley. It was once a part of the Uddiyana State of Svastu. Padma-Sambhava also known as Guru Rinpoche in Tibet. He was the same person who introduced the “Vajrayana” a noteworthy branch of Buddhism, in the Tibet, China.
Fa-Hein came to Swat Valley in 5th century A.D. He wrote about more or less 6000 Monasteries which are all in the valley. Sung-Yun visited the valley in the 6th century A.D. He pointed out about 6000 images, found in the sacred Monastery of Ta-loo, Butkara only. A Chinese pilgrim, Hiuen-Tsang, who came in the valley in the 7th century A.D, wrote about 1400 Monasteries in the Swat valley, yet a clear indication of the remains of the Buddhist monuments. We could find ruins of almost 400 Buddhist Stupas and Monasteries in Swat, even today.