As we have described in seven books the events from the time of the apostles, we think it proper in this eighth book to record for the information of posterity a few of the most important occurrences of our own times, which are worthy of permanent record. Our account will begin at this point.
Historia Ecclesiastica
Book VIII, Introduction
1 section
Eusebius of Caesarea
Trans. Arthur Cushman McGiffert, A Select Library of Nicene and Post-Nicene Fathers of the Christian Church, Second Series, Volume I, 1890. Public domain.