Causes of the decline of the Byzantine Empire

Some causes were:

-Corruption was one of the main reasons for the decline, to gain power a military general might bribe officials and soldiers guarding the wall of the city to overthrow the empire

-Most Byzantine emperors were not capable of keeping a successful army and were often incapable of leading their troops as well

-The Empire lost many important territories

-There are other reasons I cannot really think of right now