Emperor Cảnh Thịnh (chữ Hán: 景盛), born Nguyễn Quang Toản (chữ Hán: 阮光纘; 1783–1802), was the third and last emperor of the Tây Sơn dynasty. He followed his father Quang Trung (Nguyễn Huệ ruled 1788–1792) at the age of 9, and reigned for 10 years.
Cảnh Thịnh was defeated by the Nguyễn dynasty in 1802. He was taken, along with a number of his royalties, officials, and generals, to Phú Xuân. There, he was executed by Gia Long, first emperor of the Nguyễn dynasty.
The Tây Sơn dynasty (Vietnamese: [təj ʂəːn]; Vietnamese: "Nhà Tây Sơn" or "Triều Tây Sơn", (chữ Hán: 朝西山; Chữ Nôm: 茹西山), officially Đại Việt (Chữ Hán: 大越), was an imperial dynasty of Vietnam. It originated in a revolt led by three peasant brothers with the surname Nguyễn, rebelling against the Lê dynasty, Trịnh lords and Nguyễn lords (no relation). The Tây Sơn would later be succeeded by the Nguyễn dynasty.
The Tây Sơn dynasty ended the century-long war between the Trịnh and Nguyễn families, overthrew the Lê dynasty, and united the country for the first time in 200 years. They acknowledged Qing suzerainty and gained recognition from the Qianlong Emperor as the legitimate rulers of Vietnam. Under the most prominent of the Tây Sơn brothers Nguyễn Huệ (Emperor Quang Trung) Vietnam experienced several years of relative peace and prosperity. But Quang Trung died relatively young at the age of 40 and his successor Cảnh Thịnh, aged 9, was unable to prevent civil conflict among the Tây Sơn court which allowed the last Nguyễn lord Nguyễn Ánh to retake the south of Vietnam, extinguish the Tây Sơn and establish the Nguyễn dynasty.
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