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The present article endeavours to compare the doctrine of the Incarnation as found in the three great speculative works of saint Thomas Aquinas : Scriptum Super Sententiis, Summa Contra Gentiles and Summa theologiae. It begins by first examining the outline that structures these three works in order to discuss this theme before exploring the ways in which saint Thomas remedies two lacunae that ail the Lombard’s Christology (the conveniences of the Incarnation, the mysteries of the Life of Christ), as well as two of the Lombard’s christological opinions rejected by the parisian doctors, one concerning the soul separated from the body, and the other concerning the question of knowing if, during the triduum mortis, Christ was indeed a man – and finally seventeen of the articuli in quibus. In spite of its pointillistic form, this research allows for the investigation of essential aspects of saint Thomas’ Christology, underlining the evolution of his thinking and also identifying several problematic positions in his teaching.