500 years ago this month, the German monk Martin Luther delivered his 95 theses to an Archbishop of the Holy Roman Empire, and the Reformation was born. Among Luther's complaints about the Catholic Church: the practice of granting indulgences in exchange for good works or acts of piety. Although he didn't intend to cause a religious revolution, Luther would become a seminal figure in the Protestant Reformation, inspiring a schism in Christianity that resonates to this day.