Step-by-step explanation:
Jigme Namgyal of Bhutan 1825–1881) is a forefather of the Wangchuck Dynasty. He served as 48th Druk Desi (Deb Raja, the secular executive) of Bhutan (1870–1873), and held the hereditary post of 10th Penlop of Trongsa. He was called the Black Ruler.