Trịnh Kiểm (1503–1570) posthumously titled Thế Tổ Minh Khang Thái Vương (世祖明康太王), was an influential political and military figure of Đại Việt during the Southern and Northern Dynasties period. In name, he served as a supporter of the Revival Lê dynasty emperors, but in reality, he was the actual leader of the Southern Dynasty from 1545 onwards. Though his highest title during his lifetime was Thái Quốc Công (Grand Duke of the State), he is often regarded as the first Chúa (Lord) of the Trịnh family. He established his family as hereditary governors of Vietnam, ruling in the name of the figurehead Later Lê emperors.
Trịnh Kiểm was born into a poor family in Vĩnh Lộc now known as modern day Thanh Hoa. During his youth, he witnessed the Mạc Dynasty usurp the Lê throne, leading him to join Grand Duke Nguyễn Kim who was raising an army and war against the Mạc, supporting Lê Trang Tông as emperor. Recognizing Trịnh Kiểm’s exceptional prowess and strategic abilities, Nguyễn Kim married his daughter, Nguyễn Thị Ngọc Bảo, to him, entrusted him with military command, and promoted him to the title Dực Nghĩa Hầu (Marquis). Trịnh Kiểm achieved numerous victories against the Mạc forces. Which led the Emperor Lê Trang Tông himself trusting him greatly, promoting him to Đại tướng quân (Grand General) with the noble title Dực Quận Công (Grand Duke), in 1539 when he was 37 years old.
After his father-in-law Nguyễn Kim’s death in 1545, Trịnh Kiểm took over leadership of the government and military of the Lê Dynasty until his death, serving under three Lê emperors: Lê Trang Tông, Lê Trung Tông, and Lê Anh Tông. He played a major role in organizing the Southern Dynasty’s government through key decisions such as establishing his headquarters in Vạn Lại, holding civil service examinations in Confucian studies, strengthening the military, recruiting individuals based on talent and merit rather than bureaucrats, repelling Mạc invasions in Thanh Hoa and Nghệ An– reclaiming Thuận Hóa and Quảng Nam from Mạc control, and launching major northern campaigns. Although he did not achieve a decisive victory over the Mạc in his lifetime, Trịnh Kiểm laid the foundation for his descendants to complete the restoration of the Lê Dynasty, reclaim Đông Kinh (modern-day Hanoi), and establish the long-lasting Lê-Trịnh era in Vietnamese medieval history.Anh Thư Hà, Hồng Đức Trần A Brief Chronology of Vietnam's History 2000 - Page 140 "Thereafter, Trịnh Kiểm wielded all military power while Lê Trang Tông was a nominal monarch. In 1548, King Lê Trang Tông died and Trịnh Kiểm enthroned Prince Huyên - Lệ Trang Tông's son - as King Lê Trung Tông. Lê Trung Tông reigned ...David Kolzion As the Wind Blowing: Testimonies from Beyond the Tomb - Page 5- 2005 -"Kim died at war in 1545, his son-in-law Trịnh-Kiểm took over the lordship and killed Kim's elder son. The younger one Nguyễn-Hoàng was permitted to move southwards in 1558—so having since founded the NGUYỄN Lordship in the South, ... Although he was the de facto ruler of Vietnam, 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.
Early life Trịnh Kiểm’s childhood name was Trịnh Phiến (鄭𭪤), later changed to Kiểm. He was born on September 14, 1503 to Trịnh Lâu, and Hoàng Thị Ngọc Dốc, during the Cảnh Thống era of Emperor Lê Hiến Tông. He was the third of seven siblings, with four brothers and two sisters. Trịnh Khả, his great-grandfather was a regent during the reign of child-king Lê Nhân Tông, and was a close ally to Lê Lợi considered to be one of Vietnam’s greatest heroes. His birthplace was his mother’s birthplace the village of Hổ, in Vệ Quốc commune, Yên Định district, Thanh Hoa province. It was said that when he was born, a red light filled the entire room, astonishing the entire village. From a young age, he was known to be intelligent and stood out from others.
When Kiểm was six years old, his father, the family's breadwinner died. This caused his family's financial and social status to deteriorate, and they faced disdain and discrimination from other villagers. As a result, he and his mother had to relocate to the village of Sóc Sơn. To survive, Kiểm worked as a buffalo herder in the Lệ Sơn mountains at a young age. While tending buffalos, he often gathered groups of other village children, where at times due to poverty and hunger they stole chickens and ducks for food. They often played war games—splitting into teams, using the buffalo as war elephants and horses, reeds as banners, practiced fighting armed with knives and salt pots, and organizing different battle formations.
One day he came across a injured buffalo in a nearby area; knowing it was going to die eventually, he killed and cooked it to treat his friends. A villager gathering firewood came across the scene and confronted them. All the children fled except for Kiểm, who remained seated where he was. When questioned, he calmly replied:
The villagers then accused him of theft, dragged him to the village hall for punishment, where many debated whether to drown him to death in the river or report him to the officials. Ultimately, the village chief decided to expel him and his mother from returning. After being expelled, Kiểm moved to Bồ Xuyên village in Yên Mô district.
At the age of 24 (1526), he married a woman from the Trần family, whose name is recorded as Ngọc Lĩnh. He lived with her in Bồ Xuyên, but historical records do not provide further details about her fate.
Stealing his master’s horse In 1527, Dai Viet was in chaos. The ruling Lê dynasty had been overthrown by Mạc Đăng Dung, a former general who seized the throne. Many loyalists of the Lê dynasty refused to accept this change and fled to organise resistance movements. Among them was Nguyễn Kim, a powerful noble who retreated to the remote region of Cổ Lũng (modern-day Cẩm Thủy District) to plan an uprising against the Mạc, and advanced his troops. During this time, a Mạc general named Ninh Bang Hầu established his base in Vĩnh Ninh (Modern day Vĩnh Lộc). His army controlled the surrounding regions, ensuring they retain their loyalty to the new Mạc rulers. Kiểm and his mother sought refuge under Ninh Bang Hầu, hoping for stability and a better life. His mother personally begged the general to take her son into service as a household retainer, pleased with his spirit, he agreed. He assigned Trịnh Kiểm to oversee the farming estates in the hamlet Thọ Liêu where he was responsible for raising livestock, including buffaloes and horses, something he was specialized and experienced in. During his daily routine, Trịnh Kiểm befriended a Cham man who also worked in the estate named Vũ Thì An, who was an expert in training horses. Under his teachings, Trịnh Kiểm also learned how to recognise and train superior horses breeds himself.:
Ambitious, and dissatisfied with his role realizing that he had no real future of progression, one day Kiểm stole the best horse from his master’s stables and fled. Riding at full speed, he crossed the border into Mường Sùng Cổ Lũng (modern-day Bá Thước), which was then part of Ai Lao (Laos) where he intended to join a cousin Trịnh Quang, who was already fighting under the army of Nguyễn Kim’s against the Mạc dynasty. Due to going hastily, he arranged plans for his mother to reunite with him once he was settled down. His mother, however, who was left behind, fled back to her home village in Vệ Quốc knowing Ninh Bang Hau would be sworn with vengeance for this offense. When Ninh Bang Hầu discovered that Kiểm had stolen his horse and fled, he felt betrayed and was enraged. He ordered his soldiers and the villagers of Sóc Sơn and Biện Thượng to hunt down Trịnh Kiểm and his mother no matter what, offering rewards for their capture. After an extensive search, they only managed to capture his mother. Ninh Bang Hầu gave her an ultimatum.
His mother’s execution After searching, his mother found Kiểm where she decided they needed to go into hiding immediately. They hid at her brother’s house in the village of Biện Thượng. However, when the village chief discovered them, much to their surprise, instead of turning him in, feeling pity, he chose to help Kiểm. After discussing a plan among them, one night seeing a good opportunity, he threw a rock which signaled for Kiềm to escape. He quickly crawled through several layers of fences then fled to the home of a contact named Nữu in Yên Định. Nữu concealed Trịnh Kiểm by placing him into a large grain bin and covering it with rice where he was to be transported out the region. When Kiểm later in life rose to power, Nữu had already died. In gratitude for his past kindness, Kiểm rewarded Nữu’s family with a great pension for ancestral offerings and daily expenses. Despite these efforts, the villagers eventually recaptured Kiểm’s elderly mother and handed her over to Ninh Bang Hầu. Three days later, he forced the village of Sóc Sơn to place her in a bamboo cage, weighing it down with a large rock, and throwing it into the river where she drowned a slow and humiliating death. Kiểm’s close friend from the estate, Vũ Thì An, learned of the execution and immediately sent his son, Vũ Đình Tùng, to inform Kiểm. At first, Kiểm feared it was a trap, but when he realized the truth, he was devastated. Overcome with grief, he wept and swore:
He then turned to Vũ Đình Tùng and said:
Early one morning, a fisherman named Mai, who had moved from Đông Biện village to Ngạn Thượng village, spotted a body floating in the river. He went home to fetch a hoe to bury it, but when he returned, he saw something mysterious—a swarm of termites had gathered around the corpse, forming what looked like a burial mound. Word of this reached Kiểm, who—along with his cousin Trịnh Quáng and loyal friends Trịnh Bá Di and Vũ Thì An—retrieved his mother’s body and performed funeral rites. Fearing that Mạc soldiers would desecrate her grave, he had Vũ Thì An and his son wrap the body in a mat and secretly transport it through the Đường Cán Mountains to a hidden burial site in Đồng Rạng (Yên Việt Village) to rebury.
Military Career, Following Nguyễn Kim After Mạc Đăng Dung usurped the throne, the descendants of Lê dynasty officials and loyal members, especially those from Thanh Hoa, refused to accept his rule and continuously rebelled. Nguyen Kim—a noble from a prestigious family that had served the Lê dynasty for generations—fled to Ai Lao (modern-day Laos) to gather troops and plan the restoration of the Lê dynasty. By 1533, Nguyễn Kim placed the son of Emperor Lê Chiêu Tông on the throne, naming him Lê Trang Tông. The new emperor granted Nguyễn Kim the title Thái sư Hưng Quốc Công (Grand Duke). This marked the beginning of the conflict between the Southern Court (Lê-Nguyễn forces) and the Northern Court (Mạc dynasty).
Kim stationed his forces in Mường Sùng, a region in Ai Lao. During this time, Kiểm had already joined Kim’s army and was already gaining a reputation as a renowned and skilled warrior who was quickly rising in the ranks. Kim summoned him one day and began questioning him, seeing that Kiểm was articulate, brilliant, and exceptionally courageous, Kim quickly recognized his potential. Eventually, Kim appointed Kiểm as Tri Mã Cơ a (Commander of the Cavalry), placing him in charge of the military’s horses and entrusted him with leading soldiers into battle. Kiểm and his forces stationed themselves in Vạn Lại and achieved a great victory against the Mạc army. According to “History of the Kingdom of Đàng Ngoài” (Lịch sử vương quốc Đàng Ngoài) by Alexandre de Rhodes, when Mạc forces launched a massive attack on the capital, Kim and his army found themselves trapped in an enemy siege. In desperation, Kim made a promise:
“I will marry my daughter to whoever can break through the enemy lines and rescue me and my men!”