Neo-Scholasticism was a philosophical and theological school of thought that arose in the mid-nineteenth century as a revival of medieval scholasticism, especially the thought of St. Thomas Aquinas. In the later decades of the century and well into the 20th century Neo-Scholasticism dominated the Catholic intellectual milieu.Neo-Scholasticism was a philosophical and theological school of thought that arose in the mid–-nineteenth century as a revival of medieval scholasticism, especially of the thought of St. Thomas Aquinas. In the later decades of the nineteenth century and well into the twentieth, Neo-Scholasticism dominated the Catholic intellectual milieu.