Eusebian

Eusebian refers to anything related to Eusebius of Caesarea, a prominent early Christian historian and theologian. He lived from approximately 260/263 to 339/340 AD and is best known for his monumental work, the Ecclesiastical History. This history is considered the first comprehensive account of the development of Christianity from its origins to the early 4th century. Eusebius meticulously documented the lives of early Christian figures, theological debates, and the persecution and eventual triumph of the Church, particularly under the reign of Emperor Constantine the Great, whom he greatly admired.

The term "Eusebian" can also describe the theological or political positions associated with Eusebius. His writings often reflect a strong belief in the divine right of emperors and a view of the Church as intrinsically linked to the imperial state. This perspective, sometimes termed "Constantinianism" or "Eusebianism," has been both praised for recognizing the Church's integration into the broader society and criticized for potentially compromising the Church's spiritual independence. His understanding of Christology, particularly his adherence to Arianism before eventually signing the Nicene Creed, also forms part of the "Eusebian" intellectual legacy.