Trongsa Province occupied lands in central Bhutan corresponding somewhat to modern Trongsa District, although the power of the Trongsa Penlop extended far beyond his own realms, covering the entire east of Bhutan. The province was administered from the Trongsa Dzong in the town of Trongsa, and its ruling governor was known as the Penlop of Trongsa, or Tongsab.
Under Bhutan's early theocratic dual system of government, decreasingly effective central government control resulted in the de facto disintegration of the office of Shabdrung after the death of Zhabdrung Ngawang Namgyal in 1651. Under this system, the Zhabdrung reigned over the temporal Druk Desi and religious Je Khenpo. Two successor Shabdrungs – the son (1651) and stepbrother (1680) of Ngawang Namgyal – were effectively controlled by the Druk Desi and Je Khenpo until power was further splintered through the innovation of multiple Shabdrung incarnations, reflecting speech, mind, and body. Increasingly secular regional lords (penlops and dzongpons) competed for power amid a backdrop of civil war over the Zhabdrung and invasions from Tibet, and the Mongol Empire. 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. During this period, there were a total of nine provinces and eight penlops vying for power.
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). The Provinces of Kurtoed and Kurmaed were combined into one local administration, leaving the traditional number of governors at eight. While some lords were Penlops, others held the title Dzongpen (Dzongkha: རྗོང་དཔོན་; Wylie: rjong-dpon; also "Jongpen," "Dzongpön"); both titles may be translated as "governor." The Penlop of Trongsa controlled central Bhutan; the rival Penlop of Paro controlled western Bhutan; and dzongpons controlled areas surrounding their respective dzongs. The Penlop of Paro, unlike Trongsa, was an office appointed by the Druk Desi's central government. Because western regions controlled by the Penlop of Paro contained lucrative trade routes, it became the object of competition among aristocratic families.
Chogyal Minjur Tenpa (1613–1680; r. 1667–1680) was the first Penlop of Trongsa (Tongsab), appointed by Shabdrung Ngawang Namgyal. He was born Damchho Lhundrub in Min-Chhud, Tibet, and led a monastic life from childhood. Before his appointment as Tongsab, he held the appointed post of Umzey (Chant Master). A trusted follower of the Shabdrung, Minjur Tenpa was sent to subdue kings of Bumthang, Lhuntse, Trashigang, Zhemgang, and other lords from Trongsa Dzong. After doing so, the Tongsab divided his control in the east among eight regions (Shachho Khorlo Tsegay), overseen by Dungpas and Kutshabs (civil servants). He went on to build Jakar, Lhuentse, Trashigang, and Zhemgang Dzongs.:106
The 10th Penlop of Trongsa Jigme Namgyel (r. 1853–1870) began consolidating power, paving the way for his son the 12th Penlop of Trongsa Ugyen Wangchuck to prevail in battle against all rival penlops and establish the monarchy in 1907. With the establishment of the monarchy and consolidation of power, the traditional roles of provinces, their rulers, and the dual system of government came to an end.
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