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Bắc Hà Chúa Trịnh
Đoan Nam Vương
Nam Vương Cự Bảo
(Reverse With Kỷ Nguyệt)
北河鄭主
端南王
南王巨寶
(背己月)
Item number: A3069
Year: AD 1782-1786
Material: Brass
Size: 22.2 x 22.1 x 0.6 mm
Weight: 2.45 g
Provenance: Spink 2023
This coin, known as “Nam Vương Cự Bảo”, is believed to have been issued by the Trịnh lord Trịnh Khải, who held de facto control over the Later Lê dynasty court during the reign of Emperor Lê Hiển Tông. After being granted the title “Đoạn Nam Vương” in the forty-third year of the Cảnh Hưng era (corresponding to AD 1782), Trịnh Khải likely ordered the casting of this brass coin.
The coin follows the traditional East Asian form of a round coin with a square central hole. The obverse inscription reads “Nam Vương Cự Bảo” in regular script, arranged top to bottom and right to left. The calligraphy is blurred, with indistinct outlines and crude workmanship. The brass is dull and lacks lustre. The four characters are connected around the central hole, merging with the inner rim. The term “Nam Vương” is considered an abbreviated form of the title “Đoạn Nam Vương”, though some suggest it may refer instead to the title “Uy Nam Vương”, which had been granted to Trịnh Giang (in power from AD 1729 to 1740). The phrase “Cự Bảo” is an exaggerated term commonly used on coins; whether it implies a different denomination from “Nam Vương Thông Bảo” remains uncertain. The calligraphic style of the character “Cự” closely resembles that on the “Cảnh Hưng Cự Bảo” coins.
The inscription on the reverse appears to read “Kỷ Nguyệt” (“己月”) in regular script, from right to left. The reverse features a slightly more distinct rim compared to the obverse. The character “Kỷ” (己) may also be interpreted as “Tỵ” (巳) or “Nhật” (日). “Kỷ” is the sixth of the ten Heavenly Stems, while “Tỵ” is the sixth of the twelve Earthly Branches; both can be used to denote the sixth lunar month. However, as Trịnh Khải was granted the title “Đoạn Nam Vương” in the eleventh lunar month of AD 1782, and no significant event occurred in the sixth month during the following four years that would warrant commemoration, this interpretation remains speculative. If the characters are read as a cyclical year, only AD 1785 corresponds to the Ất Tỵ year within the 1782–1786 period. That year, Trịnh Khải still held power, but no major historical event is recorded. In the earlier reign of Trịnh Giang, the only Tỵ year was AD 1737 (Đinh Tỵ), during which he suppressed rebellions and commissioned the casting of a large bronze Buddha statue. Whether these events are related to the “Nam Vương Cự Bảo” coin remains undetermined. If the reverse is interpreted as the characters “Nhật” (日) and “Nguyệt” (月), combined as “Minh” (明, meaning “brightness”), the inscription may serve merely a laudatory function rather than a date.
Trịnh Giang was the eighth Trịnh lord of northern Đại Việt, reigning from AD 1729 to 1740. He was granted the title “Uy Nam Vương” in AD 1730. While he initially continued the reformist policies of his father, he soon descended into tyranny—dismissing the emperor, indulging in luxury, commissioning the construction of extravagant palaces, and excessively exploiting the populace. He also broke precedent by requesting the Qing court to grant him the title “King of Annam”, violating the long-standing practise of the Trịnh lords recognising the Lê emperors as their sovereigns and refraining from claiming royal status themselves. His reign was marked by decadence and administrative corruption, severely damaging the legitimacy of the Trịnh regime and fuelling widespread peasant uprisings and social unrest. In AD 1740, he was overthrown in a coup led by his uncle Trịnh Doanh, ending his eight-year rule. Trịnh Giang was subsequently placed under house arrest and died in AD 1762. His rule is widely regarded as the turning point that precipitated the decline of the Trịnh lords.
Trịnh Khải, originally named Trịnh Tông, was the twelfth Trịnh lord, ruling from AD 1782 to 1786. He was the son of the preceding lord, Trịnh Sâm. During his youth, he was marginalised due to the rise of imperial consort Đặng Thị Huệ and her son Trịnh Cán. In AD 1782, following Trịnh Sâm’s death, Đặng Thị Huệ installed the six-year-old Trịnh Cán as lord. However, a military uprising led by the “Three Prefectures Army” (Tam phủ quân) quickly deposed him and elevated Trịnh Khải. During his reign, Trịnh Khải attempted to stabilise central authority, but his administration was plagued by corruption, weak military discipline, and the rapid rise of the Tây Sơn movement. In AD 1786, Tây Sơn general Nguyễn Huệ (later Emperor Quang Trung) launched a northern expedition under the pretext of supporting the Lê emperor. His forces captured Thăng Long (modern-day Hanoi) with little resistance. The Trịnh forces collapsed, Trịnh Khải was captured, and shortly thereafter committed suicide. Although he nominally ruled on behalf of Emperor Lê Hiển Tông, Trịnh Khải held actual power in the north and is considered the last Trịnh lord with substantial authority before the collapse of the regime.