Revelation 7 - The Seals
The first five seals cover the same time periods of the Christian church as the seven church periods. The churches represent the spiritual side of the prophecy and what would happen spiritually in the church.
The seals have to do with government. More of a social outlook of what would happen to the Christian church during these periods. The churches had to do more with Bible truth, the seals more with social conditions. Between the two, we get a more complete picture of what would be happening to the church of God.