Frankism was a heretical Sabbatean Jewish religious movement of the 18th and 19th centuries, centered on the leadership of the Jewish Messiah claimant Jacob Frank, who lived from 1726 to 1791. Frank rejected religious norms and said that his followers were obligated to transgress as many moral boundaries as possible. At its height it claimed perhaps 50,000 followers, primarily Jews living in Poland, as well as in Central and Eastern Europe.