Answer:
The biblical land of Judah was taken over by a particularly bad horde of locusts around 400BC. You can read about this in chapter 1 of the book of Joel. Joel interpreted this as a symbol of the day of judgement, and the book records his attempts to get the people to repent.
First answer by Amandafrancis. Last edit by Amandafrancis. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 3 [recommend question].