We have to be reminded that the Bible is a religious book.
If it tells of a prophecy, it would be in the general vicinity of where the books are.
It could mean anything like this things happening anywhere.
List of famines - Wikipedia
However are "Christians" there to witness this famine?
Is the book even near that place?
Does it conform to the sequences of the seal?
Because there are 1,2,3,4,5,6,7 seals involved
and this is just the 3rd
Was the sequence followed or out of sequence?
These are things to be considered when examining history and comparing the same with bible prophecies.