December 7, 374: Ambrose is consecrated bishop of Milan, Italy. The first bishop to stand up to the emperor and win (thus creating a church-state precedent that would influence the West for a millennium), he was also an influential theologian, especially regarding the Holy Spirit. His preaching led to the conversion ofAugustine (see issue 15:Augustine and issue 67:Augustine).

December 7, 430: December 7, 430: Cyril of Alexandria condemns the Antiochene monk Nestorius, who claimed Christ was two persons ...