Although it had its own de jure governor, actual power was wielded through the 19th century by the Penlop of Trongsa, who effectively ruled eastern Bhutan.
Increasingly secular regional lords (penlops and dzongpons) competed for power amid a backdrop of civil war over the Shabdrung and invasions from Tibet, and the Mongol Empire.
[3] The penlops of Trongsa and Paro, and the dzongpons of Punakha, Thimphu, and Wangdue Phodrang were particularly notable figures in the competition for regional dominance.
[5] Traditionally, Bhutan comprised nine provinces: Trongsa, Paro, Punakha, Wangdue Phodrang, Daga (also Taka, Tarka, or Taga), Bumthang, Thimphu, Kurtoed (also Kurtoi, Kuru-tod), and Kurmaed (or Kurme, Kuru-mad).
A trusted follower of the Shabdrung, Minjur Tenpa was sent to subdue kings of Bumthang, Lhuntse, Trashigang, Zhemgang, and other lords from Trongsa Dzong.