Martin Luther was a German monk, theologian and central figure in the Protestant Reformation.
Athanasius the Great was a Christian theologian and the 20th pope of Alexandria.
Saint Ambrose was a renowned bishop of Milan and a key theologian, instrumental in the conversion of Saint Augustine and a major influence on the development of Western Christianity.
Eriugena was an influential Irish philosopher and theologian of the early Middle Ages, known for his unique synthesis of Christian and Neoplatonic thought.