Trịnh Tạc ruled Vietnam from 1657–1682 Trịnh Tạc was one of the most successful of the Trịnh lords who ruled Bắc Hà. During his rule, he made peace with the Nguyễn, ending the long war. Trịnh Tạc also captured the last small province of Annam ruled by the Mạc Dynasty.
Takes control
Trịnh Tạc took control of the Annamese government at a time when things looked bleak. The long war with the Nguyễn lords was going badly. The Trịnh armies had suffered several defeats under his father, Trịnh Tráng, and the Nguyễn armies had pushed north all the way into Nghệ An Province. Trịnh Tạc took over in 1654 and one of his armies was also defeated by the Nguyễn. However, the next year, Trịnh Tạc’s army was victorious and the Nguyễn were driven all the way back to their original provinces in the south. The Royal army attacked the great defensive walls of the Nguyễn but without success.
For the next five years, the war with the Nguyễn was put on hold while Trịnh Tạc turned his attention to Cao Bằng Province. This was the last bit of Vietnam where the Mạc Dynasty rulers still held power. Periodically they had raided into north Vietnam. The Trịnh had been prevented from the final destruction of the Mạc because they were protected by the Ming Dynasty. But now the Ming had fallen, replaced by the Manchu, and as a result, the Mạc no longer enjoyed the same relationship with the Chinese government. The Mạc made the mistake of siding with a disloyal governor and so the Kangxi Emperor withdrew his protection of the Mạc. In 1667, Trịnh Tạc defeated the Mạc army and drove them out of Cao Bằng Province.
Further conflict
In 1672, one last effort was made to break the walls of the Nguyễn. For seven months, the Royal army besieged the Nguyễn walls but, like the previous efforts, the attacks failed. In 1673, Trịnh Tạc and Nguyễn Phúc Tần came to an agreement. Peace finally came to northern Vietnam. This peace between the Nguyễn and the Trịnh was to last for the next 100 years. The Mạc invaded northern Vietnam from their new base in southern China in 1677 but this invasion was defeated by the Royal army. Trịnh Tạc died in 1682, leavingthe government in the hands of his son, Trịnh Căn.
In dynastic matters, Lê Than Tông, the man who was king twice, finally died in 1662. He was succeeded by Lê Huyen Tông. Ten years later, he died and was succeeded by Lê Gia Tông. The new Lê king died after just three years in office and so he was replaced by Lê Hy Tông. With the war ended, Vietnam was peaceful and prosperous, Trịnh Tạc had rescued the situation, even though he failed to conquer the Nguyễn.
