Patriarch (d. c.607).
Syrian by birth, Eulogius became a monk in Antioch and eventually abbot. He was a learned man and is usually known as the author of works against Eutyches and the Monophysite heresy, which had been condemned at the Council of Chalcedon in 451. This had resulted in the clear assertion that Christ is one Person in two natures, Divine and human, united unchangeably and inseparably. Unfortunately however controversies had continued, notably in Alexandria, where Eulogius was appointed Patriarch in 579.
A few years later, he met Gregory the Great at the Byzantine court, and the latter's letters refer to Eulogius who had become his close friend. Gregory encouraged Eulogius' attempts to bring back Monophysites to orthodoxy by referring to the success of Augustine's mission to Canterbury. He also reproved Eulogius for addressing him as Ecumenical Pope when Gregory's favourite title was ‘servant of the servants of God’. Gregory gave him practical help in sending some beams for a church he was building. Gregory also wrote that ‘I find nothing in your writings but what is admirable’ while the Roman Martyrology quotes his other words: ‘he is not far from me who is one with me’. Eulogius' works, although substantial, have not survived: one was in defence of Leo the Great. Feast: 13 June.
AA.SS. Sept. 4, 83–94; Bibl. SS., v. 214–7; B.L.S., ix. 115–6.