sentences:  The ban against Buddhism was relaxed in Emperor Taiwu's later years, and formally ended after his grandson Emperor Wencheng of Northern Wei, a Buddhist, took the throne in 452.In 567, former Buddhist priest Wei Yuansong (衛元嵩) submitted a memorial to Emperor "Wu Di" (武帝) (r. 561-578) of the Northern Zhou Dynasty calling for the "abolition of Buddhism".In 574 and again in 577, Emperor Wu had Buddhist and Taoist images destroyed and their clergy returned to lay life.