An ancestral house (Vietnamese: nhàthá» há»Â, chữ Nôm: è¹æÂÂ𢩠or Vietnamese: từ ÃÂðá»Âng, chữ Hán: ) is a Vietnamese traditional place of worship of a clan or its branches which is established by male descendants of the paternal line. This type of worship place is most commonly seen in northern Vietnam as well as middle Vietnam.
After a clan is divided into branches by males of paternal line, the head of the main branch of a clan (trðá»Âng tá»Âc in Vietnamese) would lead the place where all clan members worship the primitive ancestor and store the primary genealogical book. This place would be called nhàthá» ÃÂại tôn (). Other breaches of a clan would have their own nhàthá» há» in which the creators of these branches are worshipped; these nhàthá» há» are called nhàthá» chi há» ().
The size and architecture of nhàthá» há» is depended on a clan's financial resources, donations from each of the male clan members and the political status of clan elders or patriarch. A nhàthá» há» is usually built follow the traditional 3 rooms house architecture in which the middle room is extended in the back so that a worship pedestal could be placed. The worship objects such as linh tá»Âa (chair of the ghosts), giá gðáng (glass stand), and ngai (throne) will be placed in this worship pedestal. The ngai holds a vermilion-painted-and-gold-gilded box, which contains family genealogical book, and is covered by a piece of red cloth. This is the most sacred site of a nhàthá» há»Â, which people consider the gathering place of ancestors' soul.
An ancestral death anniversary will be held yearly at nhàthỠhỠand this anniversary is usually used as an occasion to renew the relationship between living clan members.