Like the his compatriots of the Antiochene school, Nestorius was a dyophysite, ironically, the position that would ultimately win the day at the Council of Chalcedon (451). Had it been as simple as the question of one or two natures, history might have been kinder to Nestorius, perhaps even vindicating him as the champion of orthodoxy rather than Cyril. But Nestorius's misstep was in the way he went about articulating the dyophysite position. For Nestorius, the two-natures Christology necessitated the reality of two corresponding hypostases or subsistences, each the proper and unique subject of its own nature. But if this were the case then how could a true union of the divine and human in Christ be posited?