The highest title in the Catholic Church, that of “Pope,” is derived from those early titles. By the late Middle Ages, priests belonging to various religious orders were called father. This practice has persisted to modern times, as priests are customarily called father today.
Who is the leader of the Protestant Church?
Martin Luther, often called the father of Protestantism, fundamentally changed the Christian world through his force of will and new ideas. He tried passionately to reform the Catholic Church.