Thyatira is during 450 A.D. to the
Reformation around 1500 A.D.
These were called the 'Dark Ages'.

For a thousand years, civilization
went backwards in christianity and
Mohammedism and Buddism were
growing stronger then.

In Rome the Papacy became corrupt.

Revelation 2:18-19 "And unto the angel
of the church in Thyatira write; . . . I
know thy works, and charity, and
service, and faith, and thy patience,
and thy works; and the last to be
more than the first."