Lady Helan 賀蘭氏, (7th century – 666 CE) was the Lady of Wei (魏國夫人) during the Tang dynasty and the niece of Wu Zetian.
The Lady of Wei was an honorific for relatives of the Emperor and Empress.
Helan Yueshi was the son of the Duke of Yingshan (應山公) and died early.
Emperor Gaozong wanted to keep Lady Helan as a concubine, but Empress Wu found out and had the Lady of Wei killed by poisoning.
Lady Helan's brother, Helan Minzhi, suspected Empress Wu of murdering his sister and was exiled.