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Which major works did St. Thomas Aquinas write?

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St. Thomas Aquinas, a preeminent Scholastic philosopher and theologian, authored a vast body of work that synthesized Christian theology with Aristotelian philosophy. His writings are generally categorized into commentaries, disputed questions, and personal syntheses.12

His major works include:

Summa theologiae: A systematic, comprehensive compendium of theology intended as an introduction for beginners, written between 1265 and 1273.324
Summa contra gentiles: A major theological treatise composed between 1258 and 1264.14
De ente et essentia (Being and Essence): A significant philosophical work written before 1256.1
De regimine principum (On the Government of Princes): A treatise on political governance composed in 1266.2
Commentaries: Aquinas wrote extensive commentaries on the works of Aristotle, such as De anima (On the Soul) and the Nicomachean Ethics, as well as on the Old and New Testaments and the Sentences of Peter Lombard.12

Additionally, he produced numerous opuscula ("little works") addressing specific theological or philosophical issues.12