1804.
according the history, hue forbidden purple city is also a very hard place with the imperial maids at that time, any imperial maids once enter the hue forbidden purple city they will have any chance to go out even meeting their parents, this made a lot of the girls lost their young ages in this place. these imperial maids must serve the king, nobody could touch their body even they are sick is the herb doctors do not allow to touch their skin to visit their sick. this made some of the imperial maids were died when they are hard sick with very young ages. hue forbidden purple city is 