Saint Thomas Aquinas, O.P. (also Thomas of Aquin or Aquino; c. 1225 – 7 March 1274) was an ItalianCatholic priest in the Dominican Order, a philosopher and theologian in the scholastic tradition, known as Doctor Angelicus, Doctor Universalis and Doctor Communis. He was the foremost classical proponent of natural theology, and the father of the Thomistic school of philosophy and theology.
One of the core values espoused by Thomas Aquinas was the belief that scientific inquiry and religious inquiry were compatible. In an alternate where some seventy years after Aquinas' death the Great Black Deaths killed 80% of the population of Europe, Christianity went through a major change when a French man named Henri was first executed and then recognized as the Second Son of God.
While Henri's views on scientific inquiry were far less hostile than the Islam's, Christianity did not embrace Aquinas' view. Thus a Scientific Revolution never took place, ensuring that the alternate's technology remained far behind that of the home timeline.
In the Summa Theologica, Thomas Aquinas rejected the notion that scientific inquiry was compatible with religious inquiry. Much of the Christian world accepted his pronouncements, and intellectual pursuits within Christianity languished from the 14th century on.
The Aquinists, who were determined to bring back the attitudes of the Middle Ages and remove all outside influence from Europe, took their name from Thomas Aquinas.