Thuận Hóa
Introduction '''Thuận Hóa''' (, ) was a historic territory in central Vietnam. It consisted of the modern provinces of Quảng Bình, Quảng Trị, and Thừa Thiên–Huế (historically, Thừa Thiên–Thuận Hóa).In 1306, the king of Champa, Chế Mân, offered Vietnam two Cham prefectures, Ô (Cham: "Vuyar") and Lý (Cham:" Ulik"), in exchange for a marriage with the Vietnamese princess Huyền Trân. The Vietnamese emperor Trần Anh Tông accepted this offer, then took and renamed Ô prefecture and Lý prefecture as Thuận prefecture and Hóa prefecture. These prefectures soon began to be referred to collectively as the Thuận Hóa region. From this time, Thuận Hóa was a territory where the Vietnamese, Chăms, and Lao frequently fought one another. In 1466, during the reign of emperor Lê Thánh Tông, Thuận Hóa became one of the 12 prefectures of Vietnam and later became a province of Vietnam.Quảng Bình, Quảng Trị, and Thừa Thiên–Huế.The Mạc dynasty usurped the throne of the Lê family to create the Northern Court, whereupon descendant of the Lê emperors was enthroned as ''de jure'' Southern court rulers by Nguyễn Kim. Shortly afterward, Nguyễn Kim, the leader of the Lê dynasty loyalists and the ''de facto'' ruler of Vietnam, was poisoned by a Mạc dynasty general. Kim's son-in-law, Trịnh Kiểm, took over the leadership and assassinated Kim's eldest son, Nguyễn Uông, in order to secure his authority. Nguyễn Hoàng, another son of Nguyễn Kim, feared having a fate like his brother Nguyễn Uông so he pretended to have mental illness and asked his sister Ngoc Bao, who was a wife of Trịnh Kiểm, to entreat Kiểm to allow Hoàng to govern Thuận Hóa, the southernmost region of Vietnam at this time. Because Mạc dynasty loyalists were still occupying Thuận Hóa while Trịnh Kiểm was busy fending off Mạc forces in northern Vietnam during this time, Ngọc Bảo's request was approved and Nguyễn Hoàng went south. After Hoàng pacified Thuận Hóa, he and his successor Nguyễn Phúc Nguyên secretly made this region loyal to the Nguyễn family; then they rose against the Trịnh lords. Vietnam erupted into a new civil war between two ''de facto'' ruling families: the clan of the Nguyễn lords and the clan of the Trịnh lords. The Nguyễn lords continuously developed the territory and turned it into a strong base for their war against the Trịnh Lord and their expansion to the south. During this time, Thuận Hóa territory spanned from Quảng Bình to Thừa Thiên–Huế. After the foundation of Nguyễn dynasty, emperor Gia Long made Thuận Hóa territory a part of ''Vùng Kinh kỳ'' (Capital territory), one of three administrative divisions of Vietnam at this time.In the 18th Century Thuận Hóa and Quảng Nam ceased producing much rice of their own and became dependent on shipments of cheaper rice from the Mekong Delta.
1945 In mid-1945; the name of Thuận Hóa was restored by Vietnamese prime minister Trần Trọng Kim but it was quickly abandoned after the decline of the Empire of Vietnam.
Other names In the West, Thuận Hóa was also known by the Portuguese, and later French, as Sinoa, Singoa, or Senna - reflecting European knowledge of Chinese pronunciations of the name (Chinese 順化 ''Shunhua'') possibly by contact with Chinese traders in Đàng Trong (Sino-Vietnamese 塘中, part of Cochinchina).
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