Which medieval theologian wrote the Summa Theologica?

The medieval theologian who wrote the Summa Theologica was Thomas Aquinas. The work, more accurately titled the Summa Theologiae, is his best-known theological synthesis and one of the major texts of medieval Christian philosophy.

Aquinas composed the Summa between 1265 and 1274, although he left it unfinished when he died. It presents Christian theology through a highly organized sequence of questions, objections, replies, and conclusions. The work addresses God, creation, human nature, ethics, Christ, the sacraments, and humanity’s return to God.

Aquinas drew heavily on Aristotle, whose works had become increasingly available in Latin through translation movements involving Greek, Arabic, and Jewish scholars. He also engaged biblical writers, Church Fathers, Islamic philosophers, Jewish thinkers, and earlier Christian theologians. His central achievement was integrating Aristotelian philosophy with Catholic theology.

William of Ockham and Duns Scotus were later Scholastic thinkers with different approaches, while Anselm of Canterbury belonged to an earlier generation. The Summa is not a single-volume biography or sermon collection; it is a systematic theological treatise containing thousands of tightly structured arguments.