Trịnh Sâm

Full name
	Trịnh Sâm (鄭森)
Regnal name
	Tĩnh Đô Vương (靖都王)
Posthumous name
	Thịnh Vương (盛王)
Temple name
	Thánh Tổ (聖祖)

Trịnh Sâm
鄭森
Trịnh Sâm; 鄭森
	Trịnh lords; Lord of Tonkin
Trịnh Lords
Reign	1767–1782
Predecessor	Trịnh Doanh
Successor	Trịnh Cán
Born	9 February 1739
Died	September 13, 1782 (aged 43)
Spouse	Dương Thị Ngọc Hoan; Trần Thị Lộc; Hoàng Thị Ngọc Khoan; Đặng Thị Huệ
Issue	prince Trịnh Khải; prince Trịnh Cán; princess Trịnh Thị Ngọc Anh; princess Trịnh Thị Ngọc Lan
Full name
	Trịnh Sâm (鄭森)
Regnal name
	Tĩnh Đô Vương (靖都王)
Posthumous name
	Thịnh Vương (盛王)
Temple name
	Thánh Tổ (聖祖)
House	Trịnh Lords
Father	Trịnh Doanh
Mother	Nguyễn Thị Ngọc Diễm
Religion	Buddhism

Trịnh Sâm (鄭森, 9 February 1739 – 13 September 1782) ruled northern Vietnam from 1767 to 1782 AD. He ruled with the title "Tĩnh Đô Vương" (or Viceroy Tinh Do), and was one of the last of the powerful Trịnh lords. Trịnh Sâm defeated the ancient enemy of the northern state, the Nguyễn lords in the south. The Trịnh line was separate from the royal Lê Dynasty, and the officially recognized king was Lê Hiển Tông (1740–1786), who continued to occupy the royal throne in Thăng Long (modern-day Hanoi), but without real power.

Early reign

Trịnh Sam was given rule over northern Vietnam by his father Trịnh Doanh in 1767. Five years after he took power, the Tây Sơn rebellion started in the south. During his lifetime, the Tây Sơn rebels focused all their efforts against the Nguyễn Lords, specifically against Nguyễn Phuc Thuan who had gained the throne as a young boy. As the Tây Sơn rebellion gained strength, the Trịnh saw the Nguyễn weakening month by month.

Trịnh–Nguyễn War

Trịnh Sâm mobilized the Royal (Trịnh) army, and on November 15, 1774, it crossed the river into Nguyễn territory, re-igniting the Trịnh–Nguyễn War. With the Nguyễn army divided and weak, the Trịnh army captured Phú Xuân (modern-day Huế) in February 1775. The army continued south capturing more Nguyễn lands and defeating some of the forces of the Tây Sơn. In the summer of 1775, one of the leaders of the Tây Sơn, Nguyễn Nhac, made a formal alliance with Trịnh Sam against the Nguyễn. Trịnh Sam agreed and gave Nguyễn Nhac a formal title as well as "regalia". The Trịnh army then withdrew back to Tonkin, left a small army in Phú Xuân.

Later life

For the remainder of Trịnh Sâm's life, the Trịnh allowed emperor Gia Long (Nguyễn Ánh), the last surviving member of the Nguyễn Lords, to make repeated attempts to re-take the south. The Tây Sơn brothers were too busy fighting the Nguyễn loyalists to worry about the Trịnh in the north. In 1782 as Trịnh Sâm was dying, he tried to leave control over Vietnam to his son (from his favorite concubine, Đặng Thị Huệ), Trịnh Cán, but his rightful heir, Trịnh Khai organized an army and fought against his half-brother. Although he was successful, this civil war fatally divided the Trịnh at a critical time when the Tây Sơn (under Nguyễn Huệ) were gaining control over the south.

In popular culture

Đêm hội Long Trì, a 1989 Vietnamese movie produced by Vietnam Feature film Studio and starring by Thế Anh as Trịnh Sâm.

Sources

Encyclopedia of Asian History, Volume 4. 1988. Charles Scribner's Sons, New York.
Tay Son Rebelion - Chronology
Annam and it Minor Currency Chapter 16 (downloaded May 2006)