Separation of powers should be the correct answer
I assume it wants you to guess the person based on the description. but I’m not sure what the answer is sorry
The main focus city of the Crusades was Jerusalem. The idea was that it was Christian territory, or at least should be Christian territory, and they always went to reconquer it. The fourth Crusade never made it to Jerusalem because they were busy sacking Constantinople which had a lot of troubles due to constant wars of the Byzantine Empire.
a. because it is relatively stable
