It is sometimes also performed by Shi'ite Muslims who commemorate the martyrdom of Husayn at the Battle of Karbala by whipping themselves into a frenzy.  
Pope Clement VI condemned the practice in 1349 as did the Council of Constance 70 years later.  In the primitive Christian church, it was apparently introduced as a punishment for disobedient clergy.  It is sometimes also performed by Shi'ite Muslims who commemorate the martyrdom of Husayn at the Battle of Karbala by whipping themselves into a frenzy.  FTP, name this religious practice that was popular in the 14th century and that involved people flogging themselves.
Pope Clement VI condemned the practice in 1349 as did the Council of Constance 70 years later.  
flagellation