| Trịnh Kiểm 鄭檢 | |
| Trịnh lords Lord of Tonkin | |
| Father: | Trịnh Lâu |
| Mother: | Hoàng Ngọc Dốc |
| Spouse: | Lại Thị Ngọc Trân |
| Issue: | Trịnh Cối Trịnh Tùng 3 more sons and 2 daughters |
| Birth Date: | 14 September 1503 |
| Birth Place: | Yên Định District, Thanh Hóa Province |
| Death Date: | 29 March 1570 |
| Full Name: | Trịnh Kiểm (鄭檢) |
| Succession: | Trịnh Lords |
| Reign: | 1545 - 1570 |
| Predecessor: | Position established |
| Successor: | Trịnh Cối |
| House: | Trịnh lords |
| Temple Name: | Thế Tổ (世祖) |
| Posthumous Name: | Minh Khang Thái Vương (明康太王) |
| Religion: | Buddhism |
Trịnh Kiểm (1503–1570) was a Vietnamese official who ruled northern Vietnam from 1545 until his death. He established his family as hereditary governors of Vietnam, ruling in the name of the figurehead Later Lê emperors. During his rule, the Lê dynasty continued to wage war with the rival Mạc dynasty.[1] [2] Although he was the de facto ruler of Vietnam during his lifetime, he never assumed a higher position for himself. When he died, his son Trịnh Tùng declared himself a lord and conferred this title posthumously upon his dead father.
Trịnh Kiểm claimed descent from Trịnh Khả, who was one of Lê Lợi's closest allies and later regent during the reign of child-king Lê Nhân Tông. His relationship to the General Trịnh who defeated a rebel army in 1511 and then led a rebellion of his own in 1517 is unknown. Also unknown is his relationship to Trịnh Duy Dai and Trịnh Duy Sản—two of the leaders of the first revolt against the usurper Mạc Đăng Dung.
A second revolt against Mạc Đăng Dung took place not long after Dung usurped the throne and proclaimed himself Emperor of Vietnam in 1527. This second revolt was led by Nguyễn Kim whose second-in-command was his son-in-law, Trịnh Khiêm (who married Kim's daughter Ngoc Bao). The second revolt allowed the Nguyễn-Trịnh army to capture the Western Capital (Tay Do) and enthroned Lê Trang Tông in 1533.
The Nguyễn-Trịnh alliance sent a formal embassy to China that denounced the usurpation of Mạc Đăng Dung and asked for help. In 1536, the Chinese delegation concluded that Dung had usurped the throne of the Lê Emperors. After hearing the report, the Jiajing Emperor dispatched an army that arrived on the border of Vietnam in 1537. However, with protestations of loyalty to the Ming dynasty and the offer of a piece of north Vietnam to the Chinese, Mạc Đăng Dung convinced the Chinese to leave. The official position of the Chinese government was that the Mạc dynasty should rule in the north and the Lê government should rule in the south. The Nguyễn-Trịnh alliance refused to accept this settlement and continued war with the Mạc.
In 1541, Mạc died and his grandson, Phước Hải, became leader of the Mạc forces. In 1545, Nguyễn Kim was assassinated by a Mạc supporter. Nguyễn had two young sons Nguyễn Hoàng and Nguyễn Uông but Trịnh Kiểm took control of the royal army.[3] [4] [5]
The Nguyễn-Trịnh alliance, now under the command of Trịnh Kiểm, continued to fight the Mạc. A new king was enthroned as Lê Trung Tông in 1548, then another Lê king, Lê Anh Tông, was enthroned in 1556. In 1558 the eldest son of Nguyễn Kim, Nguyễn Hoàng, was sent to the south to take control over the recently conquered province of Quảng Nam. By 1665, the Trịnh-led royal army had captured all provinces south of the Red River and were threatening to capture Hanoi.
In 1569, in failing health, Trịnh Kiểm passed power to his eldest son, Trịnh Coi. In 1570, Trịnh Kiểm died. In the same year, Trịnh Coi was defeated by a Mạc army and was replaced by his younger, more capable brother, Trịnh Tùng.
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