Thuận Hóa
Thuận Hóa (Sino-Vietnamese: 順化) 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, Che Man, offered Vietnam two Chăm prefectures, Ô and Lý, in exchange for a marriage with the Vietnamese princess Huyền Trân. The Vietnamese king 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 king Lê Thánh Tông, Thuận Hóa became one of the 12 prefectures of Vietnam and later became a province of Vietnam.