Urgelling Monastery of Arunachal Pradesh was first of the three monasteries built by Urgen Sangpo, the youngest brother of Terton Pempalingpa, the famous Treasure-Revealer. Urgelling Monastery was built sometime before the year 1489 AD. This was the place were in 1683 AD Tsangyang Gyatso, the Sixth Dalai Lama was born.