Jerusalem

The holy city of Israel where Christianity began.

Rome

One of the most important cities in history and Christian history, it contained the Roman Bishopric, which was among the most important offices in the early church.

Alexandria

The seat of the Bishopric and Church of Alexandria.

Antioch

The seat of the Bishopric and Church of Antioch.

Corinth, Tyer, Caesaria and other minor Dioceses

Other major cities in the Roman Empire had important early Christian Churches.

Synods

Meetings of the great bishops of the Christian religious where doctrinal disputes would be resolved.

Sacred Scripture

The books of the Bible, many of whose reliability were disputed during the entire span of Eusebius's history.

Heretical Tracts

Heretics published various important works defending their heresies.

Anti-Heretical Tracts

Orthodox Christians responded to the heretical tracts with tracts of their own.

The Bishopric

The office of Bishop, the highest office in the Christian...