Who was the German monk and composer who's list of grievances against the Catholic church sparked the Protestant reformation?

The German monk and composer who sparked the Protestant Reformation with his list of grievances against the Catholic Church was Martin Luther. In 1517, he famously published his "Ninety-Five Theses," which criticized the Church's practices, particularly the sale of indulgences. Luther's actions and writings ultimately led to a significant religious upheaval and the establishment of various Protestant denominations.