Zhu Manyue (Chinese: 朱滿月; 547–586), later known by her Buddhist name Fajing (法淨), was a concubine of Emperor Xuan (Yuwen Yun) of the Xianbei-led Northern Zhou dynasty of China.
Because someone from her family, probably her father, was accused of crimes, she was forced to be a servant and assigned to the palace of Yuwen Yun, who was then crown prince under his father Emperor Wu.
He created Yuwen Chan crown prince, and after Emperor Xuan passed the throne to Yuwen Chan and became retired emperor in spring 579 (with the atypical title of "Emperor Tianyuan" (天元皇帝, Tianyuan Huangdi), he, in another unusual move, decided to create three (and later one more) additional empresses in addition to his wife, Yang Lihua, and Consort Zhu, on account of her being the mother of Emperor Jing, received the title of Empress Tianyuan (Tianyuan Di Hou, 天元帝后, a slightly less honored title than Empress Yang's Tianyuan Huanghou (天元皇后)), later changed to Tian Huanghou (天皇后), and then further changed in 580 to Tian Da Huanghou (天大皇后).
The Emperor Jing and other members of the imperial Yuwen clan were soon slaughtered.
She died in 586 and was buried only with ceremonies due a Buddhist nun, west of the capital Chang'an.