While significant attempts to reform the Roman Catholic Church had taken place before Martin Luther, Luther with his 1517 work, the Ninety-Five Theses, is widely acknowledged to have started the Reformation. But there were others, before Luther, who preached similar reforms but did not succeed in changing the Roman Church of their time. To the names of Jan Hus, Peter Waldo, and John Wycliffe we may also add a nearly forgotten group of reformers—the ancient Waldenses.