Wu-Zu refers to five most recognized Taoists (immortals) in the history. They are Wang Cheng and his student Zhong Li Quan, his second generation student Lu Dong Bin, his third generation student Liu Hai Chan, and his forth generation student Wang Chong Yang.
Quan-Zhen Northern Lineage Daoism considers Wu-Zu as the founders and patriarchs of the lineage.