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→Defender of Orthodoxy: link to Dioscorus of Alexandria
==Defender of Orthodoxy==
These were difficult times for the Church, when [[Heresy|heretic]]s assaulted Orthodoxy with their false teachings. Leo combined pastoral attentiveness with uncompromising firmness in the confession of the Faith. He was in particular one of the basic defenders of Orthodoxy against the heresies of [[Eutyches]] and [[Dioscorus I of Alexandria]], who taught that there was only one nature in the Lord [[Jesus Christ]]. He was also a defender against the heresy of [[Nestorius]].
He actively promoted the convening of the [[Fourth Ecumenical Council]], at Chalcedon in 451, to condemn the heresy of the [[Monophysitism|Monophysites]].
