The Four Palaces (Tứ Phủ) are where “spirits of the Four Palaces” (thánh Tứ Phủ) reside in Vietnamese indigenous religion. The colour of the clothes of mediums reflects the token colour of each of the four spirits of which they are possessed. Trần Triều (literally "Trần dynasty"), the spirit of Saint Trần altars associated with Trần Hưng Đạo Supreme Commander of Đại Việt during the Trần Dynasty is distinguished from the spirits of the four palaces. The chair of the four spirits is found in many temples in Vietnam.
The four palaces are:
References
Four Palaces Wikipedia(Text) CC BY-SA