Revelation 1:20 The mystery of the seven
stars which thou sawest in my right hand,
and the seven golden candlesticks. The
seven stars are the angels of the seven
churches: and the seven candlesticks
which thou sawest are the seven churches.

The churches were made up of real,
living people who were pastors etc.

They lived in cities known today. They
are Ephesus, Smyrna, Pergamos, Thyatira,
Sardis, Philadelphia, and Laodicea.

These seven were representative and used
for teaching.