Turning off the main road into Yên Vĩnh hamlet, visitors cross flat paddy fields where almost no spot rises above another until reaching a raised earthen mound amid the plain, fronted by a bell tower and a crescent lake, atop which stands a temple facing the rising sun. Entering the Forbidden Sanctuary requires climbing several stone steps, the surviving remnant of a much higher embankment from the era when water still surrounded this mound on all sides.
This is Dạ Trạch Temple, popularly known across the region as Đền Hóa (the Temple of Ascension) or Đền Hóa Dạ Trạch, where sacred legend places the night the three immortals ascended to heaven. It worships the same triad as Đa Hòa Temple on the bank of the Red River (which has its own page in the library), while also co-worshipping King Triệu Việt Vương (Triệu Quang Phục) in connection with his sixth-century resistance base in Dạ Trạch Marsh. This article focuses specifically on this second sanctuary standing on the bed of the ancient marsh.
IThe three deities worshipped and the word Hóa (Ascension) in the temple's name
The Forbidden Sanctuary houses three bronze statues arranged in a single row: Saint Chử Đồng Tử in the center dressed in royal robes and crown, flanked by Princess Tiên Dung and Princess Tây Sa, the latter also referred to in local records and press as Princess Hồng Vân or by the title Nội Trạch Tây Cung. Placing the three figures side by side signifies the worship of a family rather than a solitary figure. In addition, according to Thế giới Di sản magazine and Dân Việt newspaper, Đền Hóa Dạ Trạch also co-worships King Triệu Việt Vương (Triệu Quang Phục), the sixth-century national hero who stationed his resistance headquarters against the Liang army right on the raised mound amid Dạ Trạch Marsh.
One clarification regarding the script: the two Chinese characters placed beside the title represent the Sino-Vietnamese toponym Dạ Trạch, literally meaning "Marsh of the Night", supplied by the library for reference rather than copied from a plaque or stele inside the temple.
This sanctuary belongs to the Vietnamese tradition of human deity veneration (thờ nhân thần), which elevates figures of legend and history to divine rank. Chử Đồng Tử is further revered as one of the Four Immortals (Tứ bất tử) alongside Tản Viên Sơn Thánh, Phù Đổng Thiên Vương, and Holy Mother Liễu Hạnh.
The word Hóa in the temple's popular name must be understood within that tradition. In classical Vietnamese usage, a deified human does not die but "transforms" or "ascends" (hóa), leaving the mortal body for a higher realm, and the place of ascension is regarded as the most sacred spot in the entire hagiography. For that reason, local people named the temple directly after the word Hóa.
The sacred narrative opens with the meeting on the midstream sandbank of the Red River, the chapter commemorated at the riverside temple. The two subsequent chapters belong directly to this inland site.
The chapter of receiving the Way recounts that during a distant trading voyage, Chử Đồng Tử met an immortal master on an offshore mountain island, stayed to study the Way, and upon leaving was given a wooden staff and a palm-leaf conical hat with instructions that miraculous power resided within those two implements whenever the staff was planted in the ground with the hat resting atop it. During that journey he also married his second consort, Princess Tây Sa (Hồng Vân).
The chapter of ascension takes place on the exact spot where the temple now stands. When the three planted the staff and rested the hat on this low-lying plain, palaces and ramparts sprang up overnight, and at midnight on the seventeenth day of the eleventh lunar month the entire citadel and its inhabitants flew up into heaven, leaving the ground beneath to subside into a vast swamp called Nhất Dạ Trạch, the One-Night Marsh. While that account belongs to legendary lore, General Triệu Quang Phục's establishment of his resistance base in Dạ Trạch Marsh in the sixth century belongs to the dynastic history of the Early Lý period.
Two common misunderstandings deserve clarification from the documentary record.
First is the word Hóa in the temple's name. Some visitors assume Đền Hóa means a temple that burned down, because the older structure was indeed destroyed in the late nineteenth century. The two facts are unrelated. Here the word Hóa comes from the sacred legend, denoting the ascension of the three immortals to heaven, a name that existed long before the late nineteenth-century destruction.
Second are the wooden staff and conical hat enshrined in the right bay. These are ritual objects symbolizing the two implements in the legend, not dated archaeological relics. Sources also vary on two details. Regarding the master who bestowed them, Lĩnh Nam chích quái names the Buddhist monk Phật Quang on Mount Quỳnh Viên, Thế giới Di sản cites local hagiography naming the immortal elder Ngường Quang on Quỳnh Lăng island, while Dân Việt records the title Ngưỡng Quy Tiên. Regarding quantity, some accounts mention one staff and one hat, while others mention two hats.
IIFrom the marshland mound to the present temple complex
The history of this site comprises distinct layers that should not be conflated. The legendary layer sets the story in the Hùng King era, the sixth-century military history links Dạ Trạch Marsh to the resistance base of Triệu Quang Phục, and the surviving architectural complex can be traced from the nineteenth century onward through dated inscriptions preserved inside the temple.
- Legend and 6th centuryThe One-Night Marsh and the base of Dạ Trạch VươngLegend places the ascension of Chử Đồng Tử in the reign of the eighteenth Hùng King at Nhất Dạ Trạch. In the sixth century, Triệu Quang Phục chose the raised mound amid the marsh as his base against the Liang army and is co-worshipped at the temple.
- 1819Carving of two stone stelae inside the templeTwo stone stelae carved in the seventeenth year of Emperor Gia Long (1819), measuring about 1.6 meters high and 0.8 meters wide, are the earliest firmly dated inscribed artifacts preserved at the temple.
- 1883Loss of the older temple structureLocal records state that the earlier temple building was destroyed in this year, meaning no timber member or roof section of the current structure predates this milestone.
- 1890Reconstruction on a Công-shaped planInhabitants of the canton rebuilt the temple on the old foundation on a Công-shaped plan comprising the Front Hall, Middle Hall, and Forbidden Sanctuary facing due east. This is the architectural layer standing today.
- Late 19th centurySubsequent restorationAccording to heritage documentation, this restoration involved contributions from residents of Vĩnh canton together with doctoral laureate Chu Mạnh Trinh.
- 1902Casting of the bronze bell Dạ Trạch Từ chungCast in the fourteenth year of Emperor Thành Thái, measuring about 1.5 meters high and 0.8 meters wide, and hung in the bell tower in front of the crescent lake.
- 1989Ranked as a National heritage siteThe temple was designated a National historical and architectural-artistic heritage site under its own decision, following Đa Hòa Temple (ranked in 1962).
- 2023 and 2024National intangible heritage and Special national heritage siteIn 2023, the temple festival was inscribed on the National List of Intangible Cultural Heritage. In 2024, the Đa Hòa - Dạ Trạch Complex was designated a Special National Heritage Site, comprising five component monuments: Đa Hòa Temple, Dạ Trạch Temple, Trung Temple, Đa Hòa Pagoda, and Triệu Việt Vương Temple.
Where sources diverge on three points, the library states the differences plainly.
Original founding date. Many popular accounts cite old texts to claim that the temple dates back nearly four thousand years to the Hùng King era, yet no source provides a verifiable construction date prior to the nineteenth century. The library therefore records the original founding year as unknown.
Heritage ranking layers. The temple carries two overlapping designations, its individual national ranking in 1989 and the joint special national ranking in 2024. The two layers complement rather than replace each other, though popular summaries often omit the 1989 milestone.
Steps leading up to the Forbidden Sanctuary. Local records state that visitors formerly climbed about nineteen steps whereas only around four remain today, without specifying whether the difference resulted from the surrounding ground level rising, courtyard paving, or both.
IIIThe Công-shaped plan and the bay enshrining the staff and hat
The temple is compact rather than sprawling. Outside, the approach opens with a bell tower standing before a crescent lake (hồ bán nguyệt), beyond which the inner sanctuary follows a Công-shaped (工) plan linking the Front Hall, Middle Hall, and Forbidden Sanctuary, flanked by two side galleries. The entire complex faces due east, the single most important directional feature when reading this shrine.
Its most distinctive interior feature lies in the Forbidden Sanctuary, whose ceiling is built as a three-tiered vaulted arch of three overlapping curved vaults that visitors often compare to standing inside the hull of a boat. In a sanctuary once surrounded by marsh water on all sides, that ceiling form is particularly telling.
The temple stands on a raised plot identified in local lore as the foundation of the legendary citadel, fronted by a crescent lake and bell tower. Around four steps now lead up to the Forbidden Sanctuary, compared with nineteen in earlier times.
The outer transverse hall features traditional curved eaves paired with gabled end walls, gong-stand and stacked-beam (giá chiêng chồng rường) trusses, and carvings of dragons and phoenixes.
The innermost chamber housing three bronze statues of the Saint and his two consorts. Its three-tiered vaulted ceiling creates a narrow, dimly lit space resembling a boat cabin.
Located in the right bay of the Middle Hall opposite the altar of General Bế. A wooden staff crowned with a conical hat rests on a throne beside an incense burner as a primary object of veneration.
The 1902 bronze bell hung in the bell tower bears the temple's name cast on its body. Together with the two stone stelae carved in the seventeenth year of Gia Long (1819), these dated inscriptions anchor the chronology of the monument.
Located in the left bay of the Middle Hall, featuring a red-lacquered, gold-gilded wooden statue of the Carp Spirit Mandarin (popularly called Ông Bế) flanked by two wooden horses, one red and one white.
Placed beside its sister temple in the complex, the two architectural approaches contrast sharply. Đa Hòa Temple spreads out across eighteen roofs facing the great river. Dạ Trạch Temple gathers itself into a compact block atop a raised mound, concentrating its distinctiveness indoors in the vaulted ceiling and the symmetrical altars of General Bế and the legendary staff and hat.
In addition to the 1902 bronze bell and the two 1819 stone stelae, the temple preserves some 54 royal investiture decrees, large calligraphic boards inscribed "Dạ Trạch từ" and "Viết thiên cổ", horizontal plaques, parallel couplets, and woodblock scriptures.
IVThe lie of the land and orientation
This section presents the library's reading through the lens of traditional geomancy, not content copied from stele inscriptions, hagiographies, or the heritage dossier. The library states this clearly so readers may distinguish documentary records from geomantic interpretation.
The very first element to read here is an elevated mound rising amid a low-lying marsh. Classical texts describe Dạ Trạch Marsh as a vast expanse of water choked with reeds and brush, containing a raised island of dry ground habitable at its center, and the temple stands directly upon that mound. Lowland geomancy holds that on a flat plain a single rise of earth is more precious than a thousand mountains, because across a level expanse the sole elevation is the only node where qi can settle and gather. The northern delta has no shortage of temples, but a sanctuary standing on an island mound amid an ancient swamp is rare.
Second is still water rather than flowing water. Classical geomancy reads the two in opposite ways. Flowing water conducts and carries qi along, making riverside shrines strong in expansion and trade. Still water retains qi in place, making marshland shrines strong in concentration and seclusion. In former times the swamp surrounded the mound on nearly all four sides so that pilgrims had to approach by boat and only laid bamboo bridges during the festival season, and today's crescent lake in front of the gate preserves a living trace of that ancient water. A sanctuary encircled by quiet water and linked to the outside world only on feast days embodies the classical posture of concealment and storage (tàng), fitting for the site entrusted by legend with keeping the final chapter of the story.
Third is the due-east orientation, the most thought-provoking aspect of the site. In traditional cosmology, due east is the direction of the rising sun and belongs to the Wood phase, signifying beginning and renewal rather than ending. Yet a sanctuary built to mark the spot where three immortals departed this world turns its face toward daybreak rather than sunset. Read alongside the name One-Night Marsh, the two fit together seamlessly: the miracle transpired in a single night, and the temple faces the direction where that night gave way to dawn. Because ascension (hóa) is not death, the temple's orientation follows the logic of transition to a luminous realm rather than mourning.
Fourth is how the architecture imitates the vanished water. The ceiling of the Forbidden Sanctuary is built in three overlapping vaulted arches that make visitors feel as if they are standing inside the hull of a boat. When marsh water still surrounded the mound, that vaulted roof echoed a vessel resting upon the water, a principle classical geomancy calls borrowing the form of the surrounding landscape. Today the marsh has largely receded, yet its memory endures inside the roof carpentry. At many lowland delta monuments, the clearest evidence of ancient topography lies not out in the fields, but inside the building's own structure.
Finally, there is a transformed landform, which the library notes candidly. Most of the ancient swamp has now become rice paddies and orchards, leaving only the crescent lake in front of the temple and a few scattered ponds. The steps up to the Forbidden Sanctuary have shrunk from nineteen to about four as the surrounding ground has risen nearly level with the temple foundation. In traditional terms, the vast water-gathering basin of the marsh has receded and the mound barely rises above the plain. Reading the landform of Dạ Trạch Temple today therefore requires holding two layers in view at once: the ancient marshland recorded in texts and the flat agricultural plain seen before one's eyes.
VThe second-month festival, the water procession at Vĩnh landing, and four annual feasts
According to heritage records and Dân Việt newspaper, across the lunar year Đền Hóa Dạ Trạch observes four major ritual feasts marking the birth and ascension of the three deities: the fourth day of the first lunar month (birth of Princess Tiên Dung), the tenth to the twelfth day of the second lunar month (centered on the birth of Princess Hồng Vân on the tenth and serving as the grand spring festival), the twelfth day of the eighth lunar month (birth of Saint Chử Đồng Tử), and the seventeenth day of the eleventh lunar month (anniversary of the trio's ascension to heaven). The traditional festival at the temple was inscribed on the National List of Intangible Cultural Heritage in 2023.
| Lunar date | Observance | Content |
|---|---|---|
| 4th day of the 1st month and 12th day of the 8th month | Birth commemoration rites | Two annual incense-offering feasts commemorating the birth of Princess Tiên Dung (1st month, 4th day) and Saint Chử Đồng Tử (8th month, 12th day). |
| 10th day of the 2nd month | Palanquin procession to Vĩnh landing to fetch Red River water | A grand procession sets out from the gate of Đền Hóa Dạ Trạch all the way to Vĩnh landing (bến Vĩnh) on the bank of the Red River, boarding boats to draw sacred midstream water before processing back to Đền Hóa. |
| 10th to 12th days of the 2nd month | Village palanquin processions and procession of the staff and hat | Village palanquins alongside the palanquin carrying the sacred staff and conical hat process along the festival route, uniting nine villages across the region. |
| 11th and 12th days of the 2nd month | Sacrificial rites and folk games | Principal sacrificial rites at the temple followed by village festivities including wrestling, cockfighting, bamboo swings, dragon and lion dances, and folk performances around the crescent lake. |
| 17th day of the 11th month | Ascension anniversary (Kỵ thánh) | The temple's own solemn observance marking the night the three immortals and their citadel ascended to heaven, held on a quieter scale focused on sacrificial rites and incense offerings by Yên Vĩnh village. |
The route of the water-fetching procession at Đền Hóa Dạ Trạch is particularly noteworthy. Although the temple lies deep within the inland plain rather than right on the riverbank like Đa Hòa Temple, on the opening day of the second-month festival the ritual cortege sets out from the gate of Đền Hóa, marches across the fields and dike all the way to Vĩnh landing (bến Vĩnh) on the Red River, boards boats to draw water from midstream, and carries it back from the river to the former marsh. That round-trip journey from marsh to river and back binds the two landscapes of the sacred legend into a single living ritual circuit.
By contrast, the ascension anniversary on the seventeenth day of the eleventh lunar month is an intimate observance of Yên Vĩnh village, without long-distance processions or noisy games, centered entirely on liturgical sacrifice. In traditional Vietnamese worship, the death or ascension anniversary is the truest inner feast of an individual shrine, whereas the spring festival belongs to the wider regional community.
VILocation And How To Get There
- Address
- Thôn Yên Vĩnh, xã Dạ Trạch cũ, nay là xã Triệu Việt Vương, tỉnh Hưng Yên
- Getting there
- The temple is located in Yên Vĩnh hamlet, former Dạ Trạch commune, now Triệu Việt Vương commune, Hưng Yên province, set inland amid the fields rather than on the riverbank. Visitors traveling along this route can easily pair their visit with Đa Hòa Temple, the sister sanctuary in the complex, which has its own page in the library.
- Coordinates
- 20.8643, 105.948
Because this is an active place of worship, house rules should be observed: dress modestly, remove hats when climbing the steps into the Forbidden Sanctuary, walk quietly and speak softly in the inner chambers, do not touch the three bronze statues, the staff and conical hat in the right bay, the statue of General Bế in the left bay, the bronze bell, or the two stone stelae, and place donations in the offering box rather than on the altars. Photography inside the Forbidden Sanctuary depends on house rules at the time, so please ask the temple caretakers first. During the festival season, yield the courtyard path when palanquin processions enter.
Nearby places in the library
VIIContribute To This Page
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?Quick Questions
Where is Dạ Trạch Temple located
In Yên Vĩnh hamlet, former Dạ Trạch commune, now Triệu Việt Vương commune, Hưng Yên province. Dạ Trạch commune merged with Hàm Tử commune to form Phạm Hồng Thái commune in late 2024, which then merged with Tân Dân, Ông Đình, and An Vĩ communes on July 1, 2025, to form Triệu Việt Vương commune, meaning the commune name changed twice within two years.
Why is it called Đền Hóa (the Temple of Ascension)
Because sacred legend identifies this site as the spot where Saint Chử Đồng Tử and his two consorts, Princesses Tiên Dung and Tây Sa (Hồng Vân), ascended to heaven. In Vietnamese human-deity veneration, an immortal does not die but ascends (hóa) to another realm, and local people named the temple after that word. The name has no connection to the destruction of the older temple building in the late nineteenth century.
Does Dạ Trạch Temple worship the magic staff and conical hat, and who else is honoured here
Yes. Alongside Saint Chử Đồng Tử and his two consorts Tiên Dung and Tây Sa (Hồng Vân) in the Forbidden Sanctuary and the co-worship of King Triệu Việt Vương (Triệu Quang Phục), the Middle Hall enshrines the symbolic wooden staff and conical hat in its right bay opposite the altar of Bế Ngư thần quan (the Carp Spirit Mandarin) and a pair of red and white wooden horses in its left bay.
When was Dạ Trạch Temple built
No contemporary document records its original founding date. The earliest dated artifacts preserved on site are two stone stelae carved in the seventeenth year of Emperor Gia Long (1819), while the surviving Công-shaped timber complex dates from the 1890 reconstruction and its bronze bell was cast in 1902.
When does the Dạ Trạch Temple festival take place and does it include a water procession
The main spring festival runs from the tenth to the twelfth day of the second lunar month, featuring a grand palanquin procession that sets out from the gate of Đền Hóa Dạ Trạch to Vĩnh landing on the Red River, boards boats to draw sacred water from midstream, and carries it back to the temple. The temple also observes feasts on the 4th day of the first month, the 12th day of the eighth month, and the ascension anniversary on the 17th day of the eleventh lunar month.