Bhutan’s early history is steeped in mythology and remains obscure. Some of the structures provide evidence that the region has been settled as early as 2000 BC. According to a legend it was ruled by a Cooch-Behar king, Sangaldip, around the 7th century BC, but not much is known prior to the introduction of Tibetan Buddhism in the 9th century, when turmoil in Tibet forced many monks to flee to Bhutan. In the 12th century, the Drukpa Kagyupa school was established and remains the dominant form of Buddhism in Bhutan today. The country’s political history is intimately tied to its religious history and relations among the various monastic schools and monasteries.

Bhutan is one of only a few countries which have been independent throughout their history, never conquered, occupied, or governed by an outside power (notwithstanding occasional nominal tributary status). Although there has been speculation that it was under the Kamarupa Kingdom or the Tibetan Empire in the 7th to 9th centuries, firm evidence is lacking. From the time historical records are clear, Bhutan has continuously and successfully defended its sovereignty.