The Obtsho Dzong ruin is said to be the seat of Obtsho Choeje offshoots. Even though not much is known about Obtsho, history records that Obtsho choeje was one of the oldest choeje in Bhutan. The current Obtsho ruin is believed to be first founded by DrupthobTerkhungpa in the early 12th century AD. It was Obtsho Lama, decedents of Obtsho Choeji, who invited Zhabdrung to Bhutan in 17th century. In Bhutan, the existing Dzongs (fortress) were mostly built by Zhabdrung during his era (17th Century) or were built later. The pre-Zhabdrung Dzongs are mostly in ruins and Obtsho Dzong ruin is one of the pre-Zhadrung Dzong.