Emperor Cảnh Thá»Ânh (), born Nguyá» n Quang Toản (; 1783âÂÂ1802), was the third and last emperor of the Tây Sán dynasty. He followed his father Quang Trung (Nguyá» n Huá» ruled 1788âÂÂ1792) at the age of 9, and reigned for 10 years.
Cảnh Thá»Ânh was defeated by the Nguyá» n 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 Nguyá» n dynasty.
Nguyá» n Quang Toản was the eldest son of Nguyá» n Huá» (Emperor Quang Trung). According to ÃÂại Nam chÃÂnh biên liá»Ât truyá»Ân, he was born to the Empress Consort Phạm Thá» Liên. After Nguyá» n Huá» crowned the emperor, Nguyá» n Quang Toản was designated as Crown Prince. In 1790, Toản received the title An Nam quá»Âc vðáng thế tá» ("Crown Prince of Annam") from China. The title indicated that his heirship was also recognized by China.
Quang Trung died in 1792. On the deathbed, Quang Trung described Nguyá» n Quang Toản as "a clever boy but too young". Toản ascended the throne and changed the Vietnamese era name to "Cảnh Thá»Ânh" () in the same year, when he was only nine years old. He granted his stepmother Bùi Thá» Nhạn the title Empress dowager. Bùi ÃÂắc Tuyên was granted the position thái sð ("Grand Preceptor"). Bùi ÃÂắc Tuyên was favoured by the young emperor, and became the de facto ruler of the country. Tuyên banished one of important ministers, Trần VÃÂn Ká»· (), from the capital Phú Xuân (modern Huế). His behavior had aroused the anger of many ministers and generals.
In 1793, Nguyá» n Nhạc was attacked by Nguyá» n lord, thus asking for Nguyá» n Quang Toản's help. Toản repulsed the attack, then annexed Nhạc's territory. Nhạc died soon after suffering from vomiting blood. Nhạc's eldest son, Nguyá» n VÃÂn Bảo, was granted the title Hiếu công by Toản. Bùi ÃÂắc Trụ () and Nguyá» n VÃÂn Huấn () were left in Quy Nhán to watch Bảo.
Tây Sán launched a powerful offensive in 1794. Two Tây Sán generals, Trần Viết Kết () and Nguyá» n VÃÂn Huấn, laid siege to Diên Khánh in 1794, but Nguyá» n lord's forces were able to keep them out. Several months later, Trần Quang Diá»Âu and Nguyá» n VÃÂn Tứ () were sent to attack Diên Khánh again. However, a coup d'état occurred in the next year, forcing Diá»Âu to withdraw. One night, Nguyá» n Quang Toản was in Bùi ÃÂắc Tuyên's house. Và © VÃÂn Dà ©ng, Phạm Công Hðng, and Nguyá» n VÃÂn Huấn besieged the house, forcing Cảnh Thá»Ânh to hand over Tuyên. Later, Tuyên was executed together with Bùi ÃÂắc Trụ and his right hand Ngô VÃÂn Sá»Â. As a niece-in-law of Tuyên, general Trần Quang Diá»Âu was not trusted by the three generals. Diá»Âu quickly marched north and stayed at An Cá»±u. In the same time, an army under Và © VÃÂn Dà ©ng and Nguyá» n VÃÂn Danh () also marched there. The young emperor was afraid because a civil war could break out at any moment. Finally, Diá»Âu was reconciled with the three generals.
Nguyá» n Quang Toản started to rule the country directly; he appointed Trần Quang Diá»Âu, Và © VÃÂn Dà ©ng, Nguyá» n VÃÂn Huấn, and Nguyá» n VÃÂn Danh (or Nguyá» n VÃÂn Tứ) as his assistants. This arrangement proved to be unsatisfactory. Not long after, Diá»Âu was removed from military leadership. Diá»Âu was fearful and anxious, from then on, he refused to attend the imperial court.
The power struggle destabilized the regime, which provided Nguyá» n lord an opportunity to launch an offensive attack in 1797. Nguyá» n VÃÂn Bảo occupied Quy Nhán and planned to surrender to Nguyá» n lord. Later on, the rebellion was put down in 1798, however, many ministers were accused of getting involved in the incident, including Lê Trung () and Nguyá» n VÃÂn Huấn, causing them to get arrested and executed. Tây Sán generals felt themselves imperilled, as they were at odds with the emperor.
In 1799, Quy Nhán was besieged by Nguyá» n ÃÂnh. Trần Quang Diá»Âu and Và © VÃÂn Dà ©ng was sent to reinforce, but was ambushed by Nguyá» n army in Thạch Tân. Hearing the news of defeat, governor Lê VÃÂn Thanh () surrendered to Nguyá» n ÃÂnh. Quy Nhán was captured by Nguyá» n lord, and its name was changed to Bình ÃÂá»Ânh. Trần Viết Kết and Há» Công Diá»Âu () spoke evil of Trần Quang Diá»Âu. Nguyá» n Quang Toản ordered Dà ©ng to kill Diá»Âu, but Dà ©ng showed the letter to Trần Quang Diá»Âu, leading Trần Quang Diá»Âu to march to Phú Xuân. Há» Công Diá»Âu was chosen as a scapegoat; he was arrested and transferred to Trần Quang Diá»Âu.
In 1800, Trần Quang Diá»Âu and Và © VÃÂn Dà ©ng were sent south to besiege Quy Nhán. Nguyá» n ÃÂnh led a large number of army to reinforce Bình ÃÂá»Ânh. However, Võ Tánh, the governor of Bình ÃÂá»Ânh, suggested that he would pin the main Tây Sán force down there so that Nguyá» n ÃÂnh could attack their capital Phú Xuân. ÃÂnh agreed, and then he marched north.
In this time, Nguyá» n Quang Toản had to deal with several internal rebellions. HàCông Thái (), a Degar leader, revolted in Thanh Hóa Province and pledged loyalty to Nguyá» n lord; a Christian-inspired revolt broke out in Tonkin. To make matters worse, Vientiane and Muang Phuan attacked Nghá» An Province, cooperating with Nguyá» n forces.
Nguyá» n Quang Toản had to ask Nguyá» n Thiếp for advice. Thiếp said it was impossible to deal with current affairs; however, if the capital could be relocated in Phðợng Hoàng trung ÃÂô (, in present-day Vinh), the lifetime of the dynasty may be prolonged. Toản vacillated for too long and the opportunity to accept was lost. In 1801, Nguyá» n ÃÂnh's army reached Tð Dung estuary (present-day ), defeating Nguyá» n VÃÂn Trá» in Quy Sán Hill. A naval battle broke out in Ná»Ân estuary (present-day ThuáºÂn An estuary); both Nguyá» n Quang Toản and Nguyá» n ÃÂnh directed the battle personally. Many Chinese pirates were hired by Tây Sán to fight against Nguyá» n lord. In Nguyá» n lord's side, several Western adventurers joined the battle, including Jean-Baptiste Chaigneau, Philippe Vannier, and Laurent André Barisy. Chaigneau described it as the fiercest battle between Tây Sán dynasty and Nguyá» n lord. The battle ended with a near annihilation of both Tây Sán navy and Chinese pirates. Three famous pirates, Mo Guanfu, Liang Wengeng (, Lðáng VÃÂn Canh), and Fan Wencai ( Phàn VÃÂn Tài), were captured by Nguyá» n lord.
The Nguyá» n army soon occupied the capital Phú Xuân. Nguyá» n Quang Toản fled to ÃÂá»Âng Há»Âi with a dozen men, then to ThÃÂng Long. In there, he was supported by his brother Nguyá» n Quang Thùy. Nguyá» n Quang Toản changed the Vietnamese era name to "Bảo Hðng" (). He made efforts to gain popularity among Northern Vietnamese. In foreign affairs, he sent an envoy to seek aid from the Jiaqing Emperor of Qing China. Meanwhile, Nguyá» n ÃÂnh also sent an envoy, extraditing Mo Guanfu, Liang Wengeng, and Fan Wencai to China. The three pirates confessed that they were supported by Tây Sán dynasty, proving that the Tây Sán dynasty had shielded many Chinese pirates. Before this incident, the Chinese government had captured two pirates, Wang Guili (, Vðáng Quý Lợi) and Fan Guangxi (, Phạm Quang Há»Â); in their vessels, the Chinese found two Tây Sán official seals. The irate Jiaqing rejected to help Nguyá» n Quang Toản, and deported his envoy.
In 1802, Nguyá» n Quang Thùy was sent to attack Là ©y Thầy (in present-day Quảng Bình Province). Later, Nguyá» n Quang Toản led around 30,000 men to march to Linh River (modern Gianh River) to attack Nguyá» n ÃÂnh. Both of their armies were beaten. Toản fled to Nghá» An, where he met Nguyá» n Quang Thùy. They fled back to ThÃÂng Long together.
Nguyá» n ÃÂnh's army marched further north. In June, they captured ThÃÂng Long. Nguyá» n Quang Toản fled across the Nhá» River (present day Red River) along with Nguyá» n Quang Thùy, Nguyá» n Quang Thiá»Âu (), Nguyá» n VÃÂn Dụng (), Nguyá» n VÃÂn Tứ, and the Empress dowager Bùi Thá» Nhạn. In Phðợng Nhãn (Lạng Giang), They were captured alive by local villagers. Nguyá» n Quang Thùy and Bùi Thá» Nhạn committed suicide; the others were transferred to Phú Xuân and executed by Nguyá» n ÃÂnh. According to ÃÂại Nam thá»±c lục, Nguyá» n Quang Toản and his three brothers, Nguyá» n Quang Duy (), Nguyá» n Quang Thiá»Âu, and Nguyá» n Quang Bàn (), were executed by slow slicing, then their bodies were dismembered by five elephants ().