"The 11 May anniversary honours Zhabdrung Ngawang Namgyel, the founder of the Bhutanese nation.

Zhabdrung Ngawang Namgyel founded the Central Monk Body, also known as the Zhung Dratshang, in 1622. He created the first Buddhist order in Bhutan and the religious-secular governance system that unified the country. Additionally, he was responsible for the building of some of the most important dzongs in Bhutan – including the Punakha Dzong, where the ceremony on 11 May took place."




https://royalcentral.co.uk/asia/bhutan/bhutanese-royals-celebrate-central-monk-bodys-founding-176497/