Martin Luther initiated the Protestant Reformation by posting his '95 Theses' containing grievances about the Catholic Church's practices.
Martin Luther started the Protestant Reformation by posting his '95 Theses' on the door of the Castle Church in Wittenberg, Germany in 1517. These theses were a list of grievances he had regarding certain practices of the Catholic Church, particularly the sale of indulgences.
https://brainly.com/question/2973841