During Lí and Trần dynasties, tattoos were extremely popular. Tattooing was already a custom to the Vietnamese before Chinese occupation, with vicious animal patterns to scare away sea monsters when working on the water. In fact, the practice was so widespread that the name of the pre-Sinicized kingdom of Vietnam was Văn Lang, or Land of the Tattooed People.
After Vietnam was occupied, this practice did not go away. By Lí dynasty, it was still present in the Vietnamese communities that worked in the sea. By the Trần dynasty, to increase the nationalism of Vietnamese, the Trần court ordered tattoos to become part of court laws. Every mandarin was required to have tattoos, or else they would not be allowed to be inside the palace. Emperors were required to have tattoos, and so did women of the harem. Servants and slaves were also tatted, and it was so widespread that when Marco Polo came to Vietnam, he described that to the Vietnamese, the more tattoos one had, the more prestigious and high class one would look.
The tattooing laws during this period was strict. One could only have tattoos at the thighs, chests, stomachs, and backs. Servants and slaves would have their occupations tatted on their foreheads to indicate their status. Only the emperors could have dragon tattoos, but not everyone adhered to that law. Tattoo patterns were varied, and mostly of animals due to the original purpose of this custom. Birds, reptiles, beasts like lions, dragons, phoenixes, and many others were used. Tattoos of words were also common, such as when soldiers tattooed 殺韃 on their foreheads when fighting against the Mongols.
This practice no longer became part of the court after Emperor Trần Anh Tông was so scared of needles that he refused to tattoo, thereby abolishing the mandatory tattoos. Although it was no longer required, the practice was still widespread, and was only completely gone from Vietnamese customs after Ming occupation. To Chinese, tattoos were only for prisoners and it was disrespectful to the body your parents gave, a belief stemming from Confucianism. This idea became widespread after Ming invasion, and stayed with Vietnamese ideals until the end of the monarchy.