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

On april 20, 1814, the dethroned emperor left france for the isle of  elba, where he was exiled under the terms of the treaty of fontainebleau.napoleon  would be allowed to ruleelba, which had 12,000 inhabitants. perhaps cruelly, the treaty allowed him to retain the title "emperor."