Eusebius of Dorylaeum was a 5th-century bishop who spoke out against heretical teachings, especially those of Nestorius and Eutyches, during the period of Christological controversy. He was bishop of Dorylaeum (or Dorylaion) which is located in Phrygia (now Turkey). The name Eusebius may also be found as Eusebios which means “pious” in Greek. The surname “of Dorylaeum” is a result of his appointment to bishop in Dorylaeum.
Read more about Eusebius Of Dorylaeum: Early Life, Opposition To Nestorius and Anastasius, First Council of Ephesus (431), Accusation of Eutyches, The Latrocinium or “Robber Council” (449), Council of Chalcedon (451)