TL;DR: There is no fixed number that applies to every household. Gia lễ books specify the generations to be worshipped and the order of spirit tablets, while the number of altars and incense bowls depends on each family's space and circumstances. A house with a single altar worshipping ancestors, grandparents, and parents together is still considered rite-compliant, as long as each incense bowl marks a clear place of worship without overlap. What must be kept is the hierarchy of above and below and the distinction between altars, not counting to reach a required number.
How many altars and how many incense bowls should a house have?
There is no fixed number that applies to every household. Traditional gia lễ books specify the generations to be worshipped and the order of spirit tablets on the altar, while the number of altars and incense bowls depends on each family's living space and circumstances. A house with only one altar worshipping ancestors, grandparents, and parents together is still considered rite-compliant, as long as each incense bowl marks a clear place of worship without overlapping. What must be kept is the hierarchy of above and below and the distinction between altars, not counting to reach a required number.
What do old gia lễ books stipulate about altars?
Gia lễ giản yếu, compiled by Dương Bá Trạc and published in 1932, condenses family rites into one volume, covering funeral rites, the để trở rite, giỗ rites, Tết rites, how to conduct ceremonies, ritual texts and prayer texts, along with sections on recording the family genealogy[1]. This book also has a genealogy section, in which the generation count takes oneself as the first generation, then parents as the second, grandparents as the third, great-grandparents as the fourth, and great-great-grandparents as the fifth, and so on[1]. This is a way of counting generations for genealogical records, not a way of counting altars.
Regarding the number of generations worshipped, Gustave Dumoutier's Le rituel funéraire des Annamites, based on a survey in Hà Nội in 1904, records a widespread custom: people kept the tablets of only four generations of ancestors counting from the father upward, namely parents, grandparents, great-grandparents, and great-great-grandparents[2]. On the day of the rite, the tablets were taken out of the cabinet or box where they were kept, unwrapped, and lined up on the altar in order from the left: great-great-grandfather, great-great-grandmother, great-grandfather, great-grandmother, grandfather, grandmother, father, mother[2]. The same source lists the required ritual objects: a stand for the tablets, a table for offerings, a low platform spread with a mat for the officiant, an incense burner, a jar for incense with a small spoon, lamps and candles, a prayer banner, a wine vessel for the rite, trays and cups, spoons and chopsticks, a bronze basin on a wooden stand, towels, and a stove[2]. The source stresses that these objects must not be used for any other purpose[2].
Gustave Dumoutier's ethnographic record of Vietnamese funerary rites and ancestor worship in Bắc Kỳ has a clear date, printed in 1904.
Is one altar or many altars the correct form?
The common arrangement in traditional houses is one main altar placed in the central bay. An article by Hồng Nhuệ in Tạp chí Nghiên cứu Tôn giáo in 2003, surveying a region of the southern Central Vietnam, describes the traditional house as usually low, with three bays, the central bay reserved for worship, and the two side bays used for receiving guests and sleeping. Besides the main ancestor altar in the central bay, the author also notes that on both sides along the walls there was often a very small additional altar, and in the middle of the courtyard a small symbolic altar erected on a tall post, with lamps, candles, incense, and flowers. Thus even within a single house, the number of altars could already be three, with different functions rather than three equal places of ancestor worship.
When a house adds a Buddha altar, a Thổ Công altar, a maternal grandparents' altar, or an altar for someone who died young, these are altars for different subjects, not subdivisions of the ancestor altar. Some modern feng shui arrangement books give their own rules for placing statues of deities and Buddhas and for altar orientation, for example holding that the altar should face the main door. This should be read as the convention of one school, not a mandatory rite: that book belongs to the interpretive feng shui genre, evidence level D, meaning it is the understanding of one line of books rather than a verified conclusion.
How many incense bowls count as rite-compliant?
In the descriptive records, each altar has one main incense burner, and the number of incense bowls is tied to the number of places of worship, not to the number of people worshipped[2]. One incense bowl can serve many generations together if the tablets are arranged together on one stand. Conversely, a house with an ancestor altar, a Thổ Công altar, and a Buddha altar has a separate incense burner on each altar, because each altar is a different system of worship.
It is worth noting that in large shrines and temples, the distinction between altars is very clear. Miếu Bà Chúa Xứ is located within the complex of the Núi Sam historical and cultural relic site in Châu Đốc city, An Giang province. The inner level has the statue of the Lady in the center; to the right of the statue, viewed from outside in, there is a stone linga over one meter tall placed on an incense table, popularly called the Cậu altar; to the left is a carved wooden yoni, called the Cô altar. The outer level is for the Hội đồng altar, with the Tiền hiền khai khẩn altar on the left and the Hậu hiền khai cơ altar on the right[3]. Each altar has its own function, and no altar replaces another. This is a reference model showing the principle of distinction by rank and function, not by number for appearance.
Table comparing altar arrangements
| Case | Number of altars | Number of incense bowls | Notes |
|---|---|---|---|
| Small house, ancestors only | 1 main altar | 1 shared incense burner | Tablets of all generations arranged on one stand |
| House with ancestors and Thổ Công | 2 separate altars | 2 incense burners | Each altar is its own system, not merged |
| House with ancestors, Buddha, Thổ Công | 3 separate altars | 3 incense burners | The Buddha altar is usually placed highest |
| Clan house, từ đường | 1 large stand | 1 main incense burner, possibly additional ones | Many generations worshipped, with an officiant |
| House with someone who died young, not yet joined to the ancestors | 1 separate altar | 1 incense burner | Worshipped separately until joining the ancestors according to local custom |
This table summarizes the descriptions in the ethnographic records and research articles cited, for comparison rather than as a mandatory rule. Each locality may have its own custom regarding the time of joining the ancestors and the placement of the altar for someone who died young.
Why does folk tradition discourage placing many incense bowls on the same altar?
Folk belief holds that each incense bowl is a seat of presence, and placing many incense bowls close together on the same altar easily makes the places of worship overlap, makes it hard to distinguish above and below, and easily confuses the words of prayer during offerings. This is how the belief is expressed, not something stipulated by any rite. Judged by the logic of distinction, this concern has a basis: if many incense bowls sit on one altar without a clear order, then when offering incense and praying, one will not know which to face first.
Comparing with Dumoutier's records, the old altar placed tablets in a fixed order from left to right, from higher generations to lower[2]. That order is precisely what ensures the offerings have a direction. When a house has many altars for different subjects, each altar again has its own position by rank: the Buddha altar higher, the ancestor altar in the central bay, the Thổ Công altar usually near the door or in a corner. This layering keeps each place of worship with a clear subject.
How can a cramped house manage?
A cramped house can still keep full rites by merging altars without merging subjects. A common approach is to use one main altar with multiple tiers: the highest tier holds a Buddha statue if Buddha is worshipped, the middle tier holds ancestor tablets, and the lower tier or a small side table holds the Thổ Công incense burner. Each tier still has its own incense burner, and each incense burner still corresponds to one subject. This keeps the principle of distinction without needing many separate altars.
Two extremes should be avoided. One is merging everything into a single incense bowl and praying jointly to all subjects, because then the prayer loses its distinction. The other is crowding many small altars into one corner, making the main altar lose its solemn position. Records of the traditional house show that the central bay was reserved for worship, not used for other purposes, meaning the solemn position of the main altar was valued more than the number of altars.
Where do the schools disagree?
There are at least three points where the sources do not agree. The first is the number of generations worshipped: the custom Dumoutier records is four generations counting from the father[2], while ancient Confucian rite codes speak of higher ranks and have separate rules by title. The Lễ Ký, in the chapter Khúc lễ hạ, states: the Son of Heaven sacrificed to heaven and earth, to the four directions, to mountains and rivers, and to the five sacrifices; the feudal lords sacrificed to their own direction and to the five sacrifices; the grand officers sacrificed to the five sacrifices; the scholars sacrificed to their ancestors[4]. That book also quotes a line from the Lễ Ký: "Vạn vật bản hồ thiên, nhân bản hồ tổ" (all things have their root in Heaven, people have their root in the ancestors), and observes that besides worshipping Heaven, ancestor worship is the most important, Heaven being sacrificed to only by the Son of Heaven while ancestors are worshipped by everyone from rulers and officials to common people[4]. The number of generations worshipped in ancient rite codes is not identical to the four-generation custom recorded in Bắc Kỳ.
The second is the orientation and position of the altar. One line of feng shui books holds that the altar must face the main door. Meanwhile the traditional arrangement in a three-bay house places the altar in the central bay, facing the courtyard and the door, but the more important position is the central bay rather than a fixed direction.
Ethnographic sources record differences between ethnic groups in the custom of ancestor worship[5].
Do the number of altars and incense bowls affect destiny?
Research sources on ancestor worship all treat it as a belief tied to morality and to family, clan, and village relations, and do not raise the question of the number of altars affecting destiny. An article by Le Van Loi in Revista Turismo Estudos e Práticas in 2021 summarizes that authors studying the Vietnamese belief system in general and ancestor worship in particular all emphasize the role of this belief in strengthening personal, family, clan, village, and national relations, while also contributing to the formation of indigenous religions and the localization of foreign religions.
Another line of research shows that ancestor worship is not found only among people who do not follow foreign religions. Tạp chí Nghiên cứu Tôn giáo in an issue published in 2013 carried an article by Bích Hằng and Phạm Thị Hồng Thi discussing the presence of ancestor worship in the lives of Catholics in Đồng Nai[6]. In that year, also in that journal, Huệ Khải analyzed the transformation from animism to ancestor worship[7]. Only the abstracts of these two articles are recorded, so they are mentioned here only to show the direction of research, without citing specific data.
In terms of calendar knowledge, books such as Gia lễ giản yếu are used to look up death anniversaries, Tết dates, and how to conduct ceremonies, and do not raise the question of the number of altars affecting fortune or misfortune[1]. If anyone says the number of incense bowls determines wealth or health, that is how folk belief speaks, with no basis in the gia lễ and religious studies sources.
Gợi ý của Nhật Nguyệt
This section is Nhật Nguyệt's interpretation, based on the principles of distinction just outlined, not the words of any book.
- A house with only one altar: place one main incense burner, arrange the tablets of the generations in order from higher to lower. If you wish to worship Thổ Công as well, use a small incense bowl placed on a lower tier or a side table, not level with the ancestor incense bowl.
- A house with both Buddha and ancestors: the Buddha altar is placed higher, the ancestor altar below. Each altar has its own incense burner. When offering incense, offer at the Buddha altar first, then the ancestor altar.
- A cramped house: use a multi-tier altar, one incense burner per tier, keeping the distinction without needing many separate altars.
- Do not place many incense bowls close together on the same table surface without a clear hierarchy of above and below, because when making offerings you will not know which to face first.
- If someone in the house has recently died, the period of separate worship before joining the ancestors should follow the custom of the locality and the clan. This is a matter for the family and the clan, with no universal rule for all places.
