This article further examines the literary relationship between the De Trinitate falsely attributed to Didymus the Blind and the works of Cyril of Alexandria, aside from their common philosophical citations. The highlighted similarities of these two authors cannot be explained by a common source; on the contrary, they indicate a direct dependence of one author upon the other. Their analysis shows that words, turns of phrase and ideas which are typical of Cyril and often occur in his writings are each used only once by Pseudo-Didymus. This evidence weighs heavily in favour of Cyril’s antecedence. In fact, the anonymous author of the De Trinitate has been influenced, in addition to fourth-century doctrinal treatises, by Cyril’s De sancta Trinitate dialogi, an anti-Arian work dating from the 420s. He also assimilated several other Cyrillian features, and was even inspired by Cyril’s anti-Arian Christology in his doctrine on the Holy Spirit. Cyril of Alexandria, therefore, has priority over Pseudo-Didymus, both chronologically and theologically.