Distinguish from 师祖: 祖师 is the historical founder of an entire school/craft (Bodhidharma for Chan, Lu Ban for carpenters). 师祖 is your personal lineage - your teacher's teacher.
Mo Xiang Tong Xiu's hit xianxia novel adapted into the donghua, live-action 'The Untamed', and manhua. Title literally 'Patriarch of the Demonic Path'.
