why not the 7th century?
-but-
this is about recapitulation which helps us understand the apocalypse by pointing out that the chapters are not necessarily in chronological order
-so-
each vision should be evaluated on its own
-and-
is not dependent on what transpired in the previous chapter
-
many here think that the return of Jesus in chapter 19
means He reigns in chapter 20
-but-
it doesn't say that in chapter 20