A. H. Francke states that, “according to popular tradition,” it was originally the foremost Bonmonastery in Ladakh; its name means sauwastika and is a popular symbol in Bon for “eternity”. Yungdrung is the name of the most popular school of Bon. It is currently affiliated with theDrikung Kagyu school of Buddhism. The Drikung history states that the Indian scholar Naropa (956-1041 CE) allegedly caused a lake which filled the valley to dry up and founded Lamayuru Monastery. The oldest surviving building at Lamayuru is a temple called Seng-ge-sgang, at the southern end of the Lamayuru rock, which is attributed to the famous builder-monk Rinchen Zangpo (958-1055 CE). Rinchen Zangpo was charged by the king of Ladakh to build 108 gompas, and certainly many gompas in Ladakh, Spiti Valley and the surrounding regions, date from his time. The oldest gompas, those dating from Rinchen-zang-po’s time — Alchi and Lamayuru, and the less accessible Wanla, Mang-gyu and Sumda — belonged at the time of their foundation to none of these Tibetan schools, whose establishment they antedate. They were at some stage taken over by the Ka-dam-pa, and when it fell into decline they were taken over again, this time mostly by the Ge-lugs-pa. The exception was Lamayuru, which was for some reason claimed by the Dri-gung-pa The gompa consisted originally of five buildings, and some remains of the four corner buildings can still be seen. Lamayuru is one of the largest and oldest gompas in Ladakh, with a population of around 150 permanent monks resident. It has, in the past, housed up to 400 monks, many of which are now based in gompas in surrounding villages. Lamayuru is host to two annual masked dance festivals in the second and fifth months of the Tibetan lunar calendar, when all the monks from these surrounding gompas gather together to pray.