The white-bird omen and the founding
The Bhutanese tradition holds that Ngagi Wangchuck, while travelling through the Bumthang valleys in the 16th century, set up camp on the ridge above the Chamkhar Chhu and saw a white bird (jakar) settle on a tree-stump nearby — a sign he took as the location for the new dzong. The dzong was founded in 1549 with the name Jakar Yugyal Dzong ('castle of the white bird, victory in all directions'). Ngagi Wangchuck was a great-grandson of the great Nyingma terton Pema Lingpa, and the dzong's founding was the Nyingma tradition's establishment of its administrative presence in the Bumthang dzongkhag.
