Seventeenth-century Iberian and Italian Scholastics had a concept of a truthmaker (verificativum) similar to that found in contemporary metaphysical debates. I argue that the seventeenth-century notion of a truthmaker can be illuminated by a prevalent seventeenth-century theory of truth according to which the truth of a proposition is the mereological sum of that proposition and its intentional object. I explain this theory of truth and then spell out the account of truthmaking it entails.