Eusebius

Eusebius is the name of several significant historical people:

• Pope Eusebius - Pope in 309 A.D.
• Eusebius of Alexandria - 6th century author in Eastern Christian Church
• Eusebius of Angers - 11th century bishop
• Eusebius of Caesarea - "The" Eusebius: famous 4th century historian of the Christian Church
• Eusebius of Nicomedia - 4th century bishop of Nicomedia.

If you aren't sure which Eusebius you are looking for, chances are that it is Eusebius of Caesarea.