Martin Luther was a German monk, theologian and central figure in the Protestant Reformation.
John Hick was a British philosopher and theologian known for his significant contributions to religious pluralism and comparative theology.
Paul Tillich was a German-American Protestant theologian and philosopher known for his existentialist approach to Christianity and his influential works in 20th-century theology.
Eriugena was an influential Irish philosopher and theologian of the early Middle Ages, known for his unique synthesis of Christian and Neoplatonic thought.